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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?

User MJegorovas
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1 Answer

4 votes
63 marbles

1
1 X 2 +1 = 3

3 × 2 + 1 = 7

15 × 2 + 1 = 31

31 ×2 + 1 = 63
User Oli Wennell
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