Question

321:9::512:15::841:40::751 :? What is the answer?

Answer 1

Answer is 42
As 3*(2+1)=9
5*(2+1)=15
8*(4+1)=40
So 7*(5+1)=42

Answer 2

Very Interesting Question  !!!. Thanks for asking .

Solution:
The correct answer is 751 :42

Explanation :

Please follow the following sequence :

321= 3 x (2 + 1 ) =3x3 =9

512 = 5 x ( 1 + 2) = 5x (3) =15

841 = 8  x (4+1) = 8x 5 =40

751 = 7 x (5+1) =7 x 6 =42

Hence the answer is 42