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In "Number Series" question, a number series is given with one term missing. Choose the correct alternative that will same pattern and fill in the blank spaces

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 ?

Option:
A. 104th
B. 105th
C. 106th
D. 64th
Answer: C . 106th

Justification:

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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