Find the 51st term of the following series: 12, 13.5, 15, 16.5, 18, ...

A78

B87 ✓ Correct

C89

D85

Correct answer: (B) 87

Explanation

The 51st term is 87.

First term a = 12 and common difference d = 1.5.

nth term = a + (n - 1)d.

51st term = 12 + 50 x 1.5.

= 12 + 75 = 87.

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