Question

Starting with one, every consecutive line has a number that is one more then twice the previous line, how many marbles must be in the sixth line?

Answer 1

63 marbles

1
1 X 2 +1 = 3

3 × 2 + 1 = 7

15 × 2 + 1 = 31

31 ×2 + 1 = 63