Select the option that is related to the third number in the same way as the second number is related to the first number.
7 : 42 :: 18 : ?
Answer & explanation
Correct answer: option 3
7 : 42 :: 18 : ?
The logic followed here is :
(Ist number)2 + Ist number = IINd number
As we know
7 : 42 :: 18 : ?
(7)2 - 7
= 49 - 7 = 42
Same as
(18)2 - 18
= 324 - 18 = 306