Question

3,7,2,4 / 8,3,1,7 / 1,6,2,?

Answer 1

Answer:

13 is the correct answer because 3 + 7 + 2 + 4 = 16 and 8+3+1+7 = 16, the difference between 19&16 is 3

and the sum of 1 + 6 + 2 + 13 = 22 and the difference between 19 and 22 is 3 so, 13 is a right answer