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Which is the next number in the following series of numbers 3, six, nine, 15, 24, 39

User Saranda
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6 votes

Answer:

a(1) = 3, a(2) = 6

For n = 1, 2, 3, .....,

a(n + 2) = a(n) + a(n + 1)

The next number is 24 + 39 = 63.

User MisterIsaak
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