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What term of the AP 10, 8, 6, 4, .... is - 28?

Correct Answer: 20

Explanation:

We have, a = 10 , d = (8 - 10) = -2, Tn = - 28
Tn = a + (n - 1)d
⇒ -28 = 10 + (n - 1) x (- 2)
⇒ -28 = 10 - 2n + 2
⇒ 2n = 12 + 28
⇒ 2n = 40
∴ n = 20


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