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.
Answer & explanation
Correct answer: option 4
THE LOGIC;
(Cube of 1st number \(\div \) 2) + 0.5 = 2nd number)
1) 3:14,
(\( {3}^{3} \) \(\div \) 2) +0.5
27 \(\div \) 2 +0.5
14
2) 5:63,
(\( {5}^{3} \) \(\div \) 2) +0.5
125 \) \(\div \ 2+0.5
63
3) 7:172,
(\( {7}^{3} \) \(\div \) 2) +0.5
343 \) \(\div \) 2+0.5
172
4) 9:355,
(\( {9}^{3} \) \(\div \) 2) +0.5
364.5+0.5
365 not 355
Thus, 9:355 is the odd one.