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4no's r in G.P such tht sum of the 1st term n 3rd term is 15 n sum of the other 2 terms is 30 find G.P?????

Plz answer as soon as possible...
Plz any 1 help me knw


Let the 1st term be a and d common ratio be r.
ar+ar^3=30            (given)
nth term of gp is ar^(n-1).
solve d equations n get d answer..
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