In any g.p ,the 4th term is 372 more than 1st term.3rd term is 60 more than 2nd term.find the first term and common ratio of g.p.
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Suppose a be the first term and r be the common ratio of the series
⇒ ar³-a=372
also
ar²-ar=60
solve the 2 equations by dividing them and then expanding r³-1 as (r-1)(r²+r+1)
and you will get a=3 and r = 5
⇒ ar³-a=372
also
ar²-ar=60
solve the 2 equations by dividing them and then expanding r³-1 as (r-1)(r²+r+1)
and you will get a=3 and r = 5
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