The second number in the given number-pairs is obtained by performing certain mathematical operation(s) on the first number. The same operation(s) is/are followed in all the number-pairs, except one. Find that odd number-pair.
Answer & explanation
Correct answer: option 3
The Logic;
1) 16 : 1024;
16 x2 = 32 x32 = 1024
2) 14 : 784;
14 x2 = 28 x28 =784
3) 18 : 1620;
18 x2 = 36 x36 = is not 1620
4) 12 : 576;
12 x2 = 24 x24 = 576
Thus, 18 : 1620 is correct.