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Four alphanumeric clusters have been given, out of which three are alike in some manner and one is different. Select the odd one.
Question

Four alphanumeric clusters have been given, out of which three are alike in some manner and one is different. Select the odd one.

A.

A12

B.

P16

C.

U21

D.

M13

Correct option is A

Given: 
Logic: The place value of the letter.
Let's check all the options: 
Option (a): A12 → A (1st letter), but 12 (Mismatch) Incorrect.
Option (b): U21 → U is on the correct position in english alphabet. Correct
Option (c): M13 → M is on the correct position in english alphabet. Correct
Option (d): P16 → P is on the correct position in english alphabet. Correct
Correct odd one out is A12.
Thus, the correct option is (a) A12

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