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which number replaces the question mark?

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posted Mar 26 by anonymous

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1 Answer

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5 = 3×2 - 1
8 = 5×2 - 2
13 = 8×2 - 3
22 = 13×2 - 4
39 = 22×2 - 5

answer Mar 27 by Tejas Naik
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