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 : ?

3.4 308 306 302

306

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