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Find the missing term in the series: 1, 1, 2, 3, 5, ?, 21.

Answer: A. 8
This is the Fibonacci series where each number is the sum of the two preceding ones: 1+1=2, 1+2=3, 2+3=5, 3+5=8, 5+8=13, 8+13=21.
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