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Question
In following question, a number series is given with one term missing. Choose the correct alternative that will same pattern and fill in the blank spaces.
Which term of the series 5, 10, 20, 40, is 1280 ?
In following question, a number series is given with one term missing. Choose the correct alternative that will same pattern and fill in the blank spaces.
Which term of the series 5, 10, 20, 40, is 1280 ?
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Solution
The correct option is B 9th
Clearly, 5 * 2 = 10, 10 * 2 = 20, 20 * 2 = 40,...
So, the series is a G.P. in which a = 5 and r = 2.
Let the number of terms be n.
Then, 5 * 2n−12n−1 n - 1 = 8 or n = 9.
Clearly, 5 * 2 = 10, 10 * 2 = 20, 20 * 2 = 40,...
So, the series is a G.P. in which a = 5 and r = 2.
Let the number of terms be n.
Then, 5 * 2n−12n−1 n - 1 = 8 or n = 9.
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