Q. 13

The 4th term of a G.P. is square of its second term, and the first term is -3. Find its 7th term.

Answer :

a = -1


T4 = (T2)2


Tn = arn-1


a.r3 = (ar)2


r3 = a.r2


r = a


r =-1


T7 = ar7-1


= (-1).r6


= -1.(-1)6


= -1.


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