Answer :

Tn = arn-1


According to the question,


T5 = a.r4


T8 = a.r7


T11 = a.r10


To Prove: q2=p.s


T5 = a.r4 = p


T8 = a.r7 = q


T11 = a.r10=s


q2= (a.r7)2 = a2.r14…(1)


p.s = (a.r4)(a.r10) = a2.r14…(2)


from (1) and (2) we get


q2=p.s


Hence, Proved.


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