Question : Directions: The second number in the given number pairs is obtained by performing certain mathematical operation(s) on the first number. The same operation(s) are followed in all the number pairs, except one. Find that odd number pair.
Option 1: (125, 91)
Option 2: (64, 61)
Option 3: (27, 37)
Option 4: (8, 20)
Correct Answer: (8, 20)
Solution :
Let's check the options –
First option:
(125, 91)→(5)
3
= 125; 5 + 1 = 6; (6)
3
= 216; 216 – 125 = 91
Second option:
(64, 61)→(4)
3
= 64; 4 + 1 = 5; (5)
3
= 125; 125 – 64 = 61
Third option:
(27, 37)→(3)
3
= 27; 3 + 1 = 4; (4)
3
= 64; 64 – 27 = 37
Fourth option:
(8, 20)→(2)
3
= 8; 2 + 1 = 3; (3)
3
= 27; 27 – 8 = 19
≠ 20
So, only the fourth option does not follow the pattern as followed by the given set of numbers. Hence, the fourth option is correct.
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