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, 8, 11, 14, is 320 ?

104th

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105th

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106th

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64th

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Solution

The correct option is D 106th
Clearly, 5 + 3 = 8, 8 + 3 = 11, 11 + 3 = 14, ....
So, the series is an A.P. in which a = 5 and d = 3.
Let the nnumbers of terms be n.
Then, 320 = 5 + (n - 1) * 3 or (n - 1) = 105 or n = 106.

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