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Manasmita Dash from B.P.D.A.V, Hyderabad
Subject :IMO    Class : Class 5

Find the odd one out.

(A) 15

(B) 21

(C) 27

(D) 31


Ans 1:

Adithya Vardhan from Loyola School, Trivandrum
Class : Class 9
option D 31 since it is a prime number

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