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The second number in the given number-pairs is obtained by performing certain mathematical operation(s) on thefirst number. The same operation(s) is/a
Question

The second number in the given number-pairs is obtained by performing certain mathematical operation(s) on thefirst number. The same operation(s) is/are followed in all the number-pairs, except one. Find that odd number-pair.(NOTE: The relation should be found without breaking down the numbers into its constituent digits)784 : 961

A.

784 : 961

B.

1764 : 1849

C.

1156 : 1225

D.

1521 : 1600

Correct option is A

In this question following logic is followed- 
(a) 784 : 961 → 282 : 312 = 31 - 28 = 3 
(b) 1764 : 1849 → 422 : 432 = 43 - 42 = 1
(c) 1156 : 1225 → 342 : 352 = 35 - 34 = 1 
(d) 1521 : 1600 → 392 : 402 = 40 - 39 = 1 
Thus, the difference of the root of the number is same except of option (a). 
Therefore, the correct answer is (a).

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