Which term of the series 5, 10, 20, 40, ..... is 1280 ?

1.	Which term of the series 5, 10, 20, 40, ..... is 1280 ?
A.	10th
B.	9th
C.	8th
D.	All of these
E.	None of these
Answer» C. 8th

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Which term of the series 5, 10, 20, 40, ..... is 1280 ?

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