Choose the correct alternative that will...

Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.
Which term of the series 5,10,20,40,.... Is 1280 ?

A

10th

B

9th

C

8th

D

None of these

Text Solution

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The correct Answer is:

A

Clearly, `5 xx 2 = 10, 10 xx 2 = 20, 20 xx 2 = 40`……..
So, the series is a G.P. in which are 5 and r = 2
1280 be the rath term of the series.
Then, `5 xx 2^(n-1) = 1280

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Choose the correct alternative that will continue the same pattern and replace the question mark in the given series. Which term of the series 5,10,20,40,.... Is 1280 ?

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Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.
Which term of the series 5,10,20,40,.... Is 1280 ?