MCQ - 456-9188

Correct Answer: B

Explanation:

In the given AP, the first term = a = 72
Common difference = d = 63 - 72 = - 9
To find: place of the term 0.
So, let a_n = 0
Since, we know that
a_n = a + (n - 1) × d
∴ 0 = 72 + (n - 1) × (-9)
⇒ - 72 = - 9n + 9
⇒ - 72 - 9 = - 9n
⇒ - 9n = - 81
⇒ n = 9
∴ 9^th term of the AP is - 81.