Foundation
Mathematics Foundation
nth term of AP
Question
Which term of the AP 21, 42, 63, 84, ..... is 210 ?
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Solution
Let Tn = 210. Then, 21 + (n – 1) × 21 = 210
(n × 1) × 21 = 189 ⇒ n – 1 = 9 ⇒ n = 10.