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InterviewSolution
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If in an A.P., first term is 20, common difference is 2 and n^th term is 42, then find n.(a) 10(b) 11(c) 12(d) 14The question was posed to me in homework.I would like to ask this question from Arithmetic Progression(A.P.) topic in chapter Sequences and Series of Mathematics – Class 11 |
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Answer» RIGHT answer is (c) 12 Easiest EXPLANATION: We KNOW, a=20, d=2, an=42. a+(n-1) d = 42 => 20 + 2(n-1) = 42 =>2(n-1) = 42-20=22 => n-1 =11 => n=12. |
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