Directions:(1-5) Study the following information carefully and answer the questions given below.
6 2 5 6 2 4 9 7 4 1 3 4 9 6 3 9 5 4 3 5 1 2 1 4 5 2 9 3 7 4 6 2 4

1. If all the even digits are deleted from the above arrangement, which of the following will be seventh from the right end of the arrangement?

Ans:2
5 9 7 1 3 9  3 9 5  3 5 1  1  5  9 3 7

2. How many such 2s are there in the above arrangement each of which is immediately preceded by odd digit and also immediately followed by an odd digit?
6 2 5 6 2 4 9 7 4 1 3 4 9 6 3 9 5 4 3 5 1 2 1 4 5 2 9 3 7 4 6 2 4

Ans:2
6 2 5 6 2 4 9 7 4 1 3 4 9 6 3 9 5 4 3 5 1 2 1 4 5 2 9 3 7 4 6 2 4

3. How many such 1s are there in the above arrangement each of which is immediately preceded by a perfect square?
6 2 5 6 2 4 9 7 4 1 3 4 9 6 3 9 5 4 3 5 1 2 1 4 5 2 9 3 7 4 6 2 4


Ans:1
6 2 5 6 2 4 9 7 4 1 3 4 9 6 3 9 5 4 3 5 1 2 1 4 5 2 9 3 7 4 6 2 4

4. Which of the following is fourth to the right of the eleventh digit from the right end of the above arrangement?
6 2 5 6 2 4 9 7 4 1 3 4 9 6 3 9 5 4 3 5 1 2 1 4 5 2 9 3 7 4 6 2 4

Ans:1
6 2 5 6 2 4 9 7 4 1 3 4 9 6 3 9 5 4 3 5 1 2 1 4 5 2 9 3 7 4 6 2 4

5. Which of the following is seventh from the left of the nineteenth digit from the left end of the above arrangement?
6 2 5 6 2 4 9 7 4 1 3 4 9 6 3 9 5 4 3 5 1 2 1 4 5 2 9 3 7 4 6 2 4

Ans:3
6 2 5 6 2 4 9 7 4 1 3 4 9 6 3 9 5 4 3 5 1 2 1 4 5 2 9 3 7 4 6 2 4

Directions:(6-10) Study the following arrangement carefully and answer the questions given below:
5 1 2 9 3 8 7 1 4 6 8 3 2 3 9 7 1 2 5 4 8 9 3 5 4 6 7 6

6. If all the odd numbers are dropped from the above sequence, what is the sum of the numbers present in the odd position of the sequence?

Ans:2
5 1 2 9 3 8 7 1 4 6 8 3 2 3 9 7 1 2 5 4 8 9 3 5 4 6 7 6
If all the odd numbers are dropped from the above sequence, we get
2 8 4 6 8 2 2 4 8 4 6 6
Sum of the numbers in odd position of the sequence,
=2+4+8+2+8+6
= 30

7. How many such multiples of 2 are there in the above sequence which is immediately preceded by even number?
5 1 2 9 3 8 7 1 4 6 8 3 2 3 9 7 1 2 5 4 8 9 3 5 4 6 7 6

Ans:4
5 1 2 9 3 8 7 1 4 6 8 3 2 3 9 7 1 2 5 4 8 9 3 5 4 6 7 6
Multiples of 2 in the above sequence which is immediately preceded by even number
46, 68, 48, 46
There are four such multiples of 2 are there in the above sequence which is immediately preceded by even number.

8. If all the odd numbers in the sequence are replaced by alphabets starting from A from the left, then which number is replaced by alphabet ‘G’?
5 1 2 9 3 8 7 1 4 6 8 3 2 3 9 7 1 2 5 4 8 9 3 5 4 6 7 6


Ans:3
5 1 2 9 3 8 7 1 4 6 8 3 2 3 9 7 1 2 5 4 8 9 3 5 4 6 7 6
If all the odd numbers in the sequence are replaced by alphabets starting from A, we get
A B 2 C D 8 E F 4 6 8 G 2 H I J K 2 L 4 8 M N O 4 6 P 6
‘G’ is replacing ‘3’.

9. If every alternate number is dropped from the left end (1 is dropped), how many even numbers have even numbers as both of their neighbours?
5 1 2 9 3 8 7 1 4 6 8 3 2 3 9 7 1 2 5 4 8 9 3 5 4 6 7 6

Ans:2
5 1 2 9 3 8 7 1 4 6 8 3 2 3 9 7 1 2 5 4 8 9 3 5 4 6 7 6
If every alternate number is dropped from the left end,
we get 5 2 3 7 4 8 2 9 1 5 8 3 4 7
Only one even number have even number on its neighbors.

10. If all the even numbers are increased by 1 in the given sequence, then how many 3’s are there in the new sequence?
5 1 2 9 3 8 7 1 4 6 8 3 2 3 9 7 1 2 5 4 8 9 3 5 4 6 7 6

Ans:5
5 1 2 9 3 8 7 1 4 6 8 3 2 3 9 7 1 2 5 4 8 9 3 5 4 6 7 6
If all the even numbers are increased by 1 in the given sequence, we get
5 1 3 9 3 9 7 1 5 7 9 3 3 3 9 7 1 3 5 5 9 9 3 5 5 7 7 7
There are seven 3’s in the new sequence.

Pages: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

5 thoughts on “Alphanumeric Series Questions for Competitive Exams”

  5. Emmett Ghibaudy

    Having read this I thought it was very informative. I appreciate you taking the time and effort to put this article together. I once again find myself spending way to much time both reading and commenting. But so what, it was still worth it!

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top