NCHMCT JEE 2012 Question Paper with solutions for online practice

Question : 32 of 200

Marks: +1, -0

Four of the following five are alike in a certain way and so form a group. Which is the one that does not belong to that group?

Solution:

143 ⇒

(12)^2

– 1 = 144 – 1
168 ⇒

(13)^2

– 1 = 169 – 1
224 ⇒

(15)^2

– 1 = 225 – 1
63 ⇒

(8)^2

– 1 = 64 – 1
But, 37 ⇒

(6)^2

+ 1 = 36 + 1

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