Question

Fill in the missing number:
13, 21, 29, 34, 43, 92, 12, ?

• A. 84
• B. 31
• C. 92
• D. 12
• E. None of the above

Answer 1

The correct option is B 31

Making pairs taking the first number from the right and the first number from the left, the 2nd number from the right and the 2nd number from the left and so on.
(13, ?); (21, 12); (29, 92); (34, 43)
In each pair numbers have their digits reversed keeping this pattern, ? should be 31.