Find the 20th and nth terms of the G.P. 52,54,58,...
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Solution
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The given G.P. is 52,5458,... Here, a= first term =52,r= common ratio =5452=12 ∴a20=ar20−1=52(12)19=5(2)(2)19=5(2)20 and an=arn−1=52(12)n−1=5(2)(2)n−1=5(2)n
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Find the 20th and nth terms of the G.P. 52,54,58,...