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If first term of a G.P. is 20 and common ratio is 4. Find the 5^th term.(a) 10240(b) 40960(c) 5120(d) 2560This question was posed to me in an interview for job.This intriguing question comes from Geometric Progression(G.P.) topic in division Sequences and Series of Mathematics – Class 11

Answer» RIGHT ANSWER is (c) 5120

The best explanation: GIVEN, a=20 and r=4.

We KNOW, an = ar^n-1

=>a5 = 20*4^4 = 20*256 = 5120.


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