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Find the missing number (?) in the given series.
1, 2, 3, 5, 8, 13, 21, ?
Each term is the sum of the two terms before it, as $$1 + 2 = 3$$, $$2 + 3 = 5$$ and $$8 + 13 = 21$$. So the next term is $$13 + 21 = 34$$.
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