[106th] Which term of the series 5, 8, 11, 14,…..is 320?

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Aptitude

TNPSC G4

10th CBSE Maths

Which term of the series 5, 8, 11, 14,…..is 320?

104th

105th

106th

64th

Explanation:
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) x 3 or (n – 1) = 105 or n = 106.

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