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In the following question, select the odd number–pair from the given alternatives :

a

121 – 196

b

441 – 484

c

25 – 36

d

169 – 196

Answer : Option A
Explanation :

Except the number-pair ’121–196’, in all other number-pairs both the numbers are perfect squares of consecutive numbers.

441 484

↓ ↓

(21)² – (22)²

25 – 36

↓ ↓

(5)² – (6)²

169 – 196

↓ ↓

(13)² – (14)²

But,

121 – 196

↓ ↓

(11)² (14)²

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