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Question
Which term of the AP 72, 63, 54, ... is 0?
Options
8th
9th
10th
11th
MCQ
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Solution
9th
Explanation:
First term a = 72 and common difference d = 63 – 72 = –9.
nth term: Tn = a + (n – 1)d
= 72 + (n – 1)(–9)
= 81 – 9n
Set Tn = 0
⇒ 81 – 9n = 0
⇒ n = 9
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