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Generation Bee

Question

Every male bee has just a female parent, while every female bee has both a male and a female parent. How many ancestors does a male bee have, counting twenty generations?
Note: Don't count this male as a generation or include him in the 'final tally.'

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28655 bees. After the 5th generation I realized what was going on.

I have you slightly off.

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M(n) = F(n+3) - 2


where M(n) is a number of ancestors of a male bee counting n generations and F(k) stands for k-th Fibonacci number

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