In the given series, 1.5, 0.5, -0.5, -1.5, .... , -8.5 If $n^{t h}$ term is -8.5, find n.

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Solution

The correct option is B
11

a = 1.5; d = 0.5 - 1.5 = -1

a + (n-1)d = -8.5

1.5 + (n-1)(-1) = -8.5

(n-1)(-1) = -10

n-1 = 10

n = 11

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