In A.P. 171, 162, 153, ………. Find first negative term. - Vidyadip

MCQ

In A.P. 171, 162, 153, ………. Find first negative term.

A
0
B
-2
C
-6
D
-9

✓

Answer

-9

Solution:

Explanation: a = 171 and d = 162 - 171 = -9.

a_n<0

⇒ 171+(n - 1) (-9) < 0

⇒ 180 - 9n < 0

⇒ 9n > 180

⇒ n > 20 ⇒ n = 21 for first negative term.

First negative term is 171+(20) (-9) = 171 - 180 = -9

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