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Examples on Alpha - Numeric Series 

Example 1: 

Find the element which is 9th to the left of the 7th element from the right end?

a) Z     

b) @   

c) U

d) 1     

e) None of these.

Solution:

7th element from the right end is – G

9th element to the left of G is Z

So, the answer is Z.

Now, shortcut.

Here we have to find the 9th to the left of the 7th element from the right end.

So, for this,

9th + 7th = 16th from the right end 

The 16th element from the right end is Z

So, the answer is Z.

This is option (a).

Example 2: 

Find the element which is 12th from the left end?

a) 2     

b) 9     

c) %

d) @   

e) None of these   

Solution:

In the above arrangement, 9 is the element that is 12th from the left end.

Example 3:

Find how many symbols are there which are immediately preceded by a number and followed by an alphabet?

a) 2       

b) 3       

c) 4

d) 1       

e) None of these

Solution:

9@Z 

5!D

6*L

So, the answer is 3. 

Which is option (b).

N.B: Proceeded by means immediately previous. Followed by means immediately after.

Example 4:

The following questions are based on the five three digit numbers. 

365, 587, 452, 645, 729.

Q.1:   If the first and third digits of each of the numbers are interchanged, then which of the following will be the third digit of the third highest number?

a) 4     

b) 3     

c) 5

d) 7     

e) None of these.

Q.2:   If all the numbers are arranged in descending order from left to right then find the difference between the numbers which are second from the left and second from the right?

a) 193   

b) 213   

c) 183

d) 225   

e) None of these

Q.3:  What will be the result if the 2nd digit of the highest number is added with the third digit of the lowest number?

a) 10   

b) 11   

c) 12

d) 13   

e) None of these 

Q.4: If all the digits of each number are arranged in ascending order within the number then which will be the lowest?

a) 729   

b) 452   

c) 365

d) 645   

e) 587

Q.5:  What is the difference between the highest and lowest number?

a) 358   

b) 364   

c) 485   

d) 235   

e) None of these

Solution:

1. 365    587   452    645    729

The first and third digits are interchanged then, 

    563   785   254     546    927

The third highest number is 563.

So, the third digit is  3.

So, option (b) is correct.

2. If all the numbers are arranged in descending order from left to right then,

    729    645   587    452    365 

The second number from the left end is 645

Second number from the right end 452

Difference = 645 - 452 = 193

So, option (a) is correct.

3. The second digit of the highest number is 2

The third digit of the lowest number is 5

So, resultant is 2 + 5 = 7

So, option (e) is correct.

4. 

365    587    452   645    729

If all the digits of each number are arranged in ascending order within the number then,

256    578    245   456    279

So, the lowest number is 245 which comes from 452.

So, option (b) is correct

5. 

The highest number is 729

The lowest number is 365

So, the difference is 364

So, option (b) is correct.

Example 5:

Study the following arrangements carefully and answer the following question?

3 @  9  ! 6  A  B 2  #  5 @  7  M 2  D  $   3 N  6  * 6  1

Q.1:   How many symbols are there in the above arrangement?

a) 7   

b) 6   

c) 8

d) 9   

e) None of these

Q.2:   If all the symbols are withdrawn from the series then which will be 3rd to the left of 5th from the right end?

a) M     

b) 5     

c) 7

d) 2     

e) None of these 

Q.3: How many alphabets are there which are immediately preceded and followed by both numbers?

a) 4     

b) 3     

c) 2

d) 1     

e) None of these

Q.4:  What is the sum of all the numbers between ! and *?

a) 29     

b) 25     

c) 27

d) 23     

e) None of these

Q.5:   Find the element which is 3rd to the right of 7th from the right end?

a) 3     

b) 9

c) *

d) 6     

e) None of these

Solution:

1. Total symbol is 6

So, option (b) is correct.

2. If all the symbols are withdrawn from the series then the series will be 

    3 9   6   A  B   2   5  7   M   2  D   3   9  6   6   %

Now, 3rd to the left of 5th from the right end means (3 + 5)th = 8th from the right end.

M is the 8th element from the right end.

So, option (a) is correct. 

3. 7  M  2

    3  N  6

There are two alphabets which are both preceded and followed by numbers.

So, option (c) is correct.

4.  Numbers between ! and * are 6, 2, 5, 7, 2, 3

Sum = 6 + 2 + 5 + 7 + 2 + 3 = 25

So, option (b) is correct.

5.  3rd to the right of 7th from the right end.

If means (7 - 3)th = 4th from the right end.

So, 6 is the 4th element from the right end.

So, option (d) is correct.

More examples on Alpha Numeric Series 

Example 1:

How many pairs of letters are there in the word ‘CONSERVATION’ which has as many letters between them as present in English alphabetical order?

a) 6       

b) 5      

c) 7

d) 4       

e) None of these

Solution:

So, six pairs of letters are there which have as many letters between them as English alphabet letters. 

So, option (a) is correct. 

Example 2:

The given questions are based on five words which are as given.

   PET   RAT  TIN   FUR  LED

Q.1:  If the last letter of each word is replaced by the next letter then how many words have at least two vowels?

a) 2   

b) 3   

c) 1

d) 4   

e) None of these

Q.2: If all the words are written side by side without any gap from left to right, then which of the following letter will be 9th to the right of the 2nd vowel from the left?

a) E   

b) L   

c) D

d) R   

e) None of these

Q.3:  If all the vowels in all the words are dropped and all the remaining letters are written in alphabetical order from left to right then which is the 7th from the right end?

a) N   

b) T   

c) R

d) F   

e) None of these

Q.4: If all the letters are written side by side without a gap and every second letter is dropped then how many vowels will remain there?

a) 1   

b) 2   

c) 3

d) 4   

e) None of these

Q.5: If the first letter of each word is replaced by B, then how many meaningful words are formed?

a) 2   

b) 3   

c) 4

d) 5   

e) None of these

Solution:

1. PET   RAT   TIN  FUR   LED

The last letter of each word is replaced by the next letter as per the alphabet. So, the new words are

PEU   RAU  TIO   FUS   LEE

So, 4 words have at least 2 vowels.

So, option (d) is correct.

2. If all the letters are written side by side then,

PETRATTINFURLED

2nd vowel from the left end – A

9th letter to the right of A is - E 

So, option (a) is correct.

3. If all the vowel are dropped and all the remaining words were written side by side then,

     PTRTTNFRLD

So, the 7th letter from the right end is – T

So, option (b) is correct.

4. If all the letters are written side by side then,

     PETRATTINFURLED

If every second letter is dropped 

     PTATNULD

So, there are two vowels remaining in the string.

So, option (b) is correct.

5. If the first word is replaced by B then, the words will be

BET   BAT  BIN   BUR   BED

Here all are meaningful words

So, option (d) is correct.

Example 3:

How many pairs of numbers are there in the number ‘3  6 9  2  4 3  7  5 9  2  1  4’ which has as many numbers between them as present in the number system?

a) 3   

b) 4   

c) 2

d) 5   

e) None of these

Solution:   

3   6   9  2   4   3   7   5   2  1   4

(i)  3 6 9 2 4 3 7 5 2 1 4 – (2 and 1)

(ii)  3 6 9 2 4 3 7 5 2 1 4 – (2 and 4)

(iii)  3 6 9 2 4 3 7 5 2 1 4 – (3 and 4)

(iv)  3 6 9 2 4 3 7 5 2 1 4 – (3 and 5)

So, 4 pairs of numbers are there.

So, option (b) is correct.