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In the AP 18, 27, 36, …, aₙ = 189. Find n.AP 18, 27, 36, … में aₙ = 189 है। n ज्ञात कीजिए।
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: 2020
Here the first term is 18 and the common difference is 9. Using aₙ = a₁ + (n − 1)d, 189 = 18 + 9(n − 1), so n − 1 = 19 and n = 20.यहाँ पहला पद 18 और सार्व अंतर 9 है। सूत्र aₙ = a₁ + (n − 1)d से 189 = 18 + 9(n − 1), इसलिए n − 1 = 19 और n = 20।
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