Question
Which term of the series 5, 8, 11, 14, …. is 320
A. 65th
B. 107th
C. 105th
D. 106th
Answer: D. 106th
Solution:
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 320 be the nth term of the series.
Then, 320 = 5 + (n – 1) × 3
=> (n – 1) = 105
=> n = 106.
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