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Question

Let a1,a2,a3 be in A.P and let ap,aq,ar be in G.P., then aqap=_____.

A
rpqp
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B
qprq
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C
rqqp
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D
pqpr
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Solution

The correct option is C rqqp
a1=pth term
a2=qthterm
a3=rthterm
aqap=r=araqaq=rapar=raqaqarapaq=r
Since a1,a2,a3 are in AP
[a+(q1)d][a+(r1)d][a+(p1)d][a+(q1)d]=ra+qddard+da+pddaqd+d=rd(qr)d(pq)=rr=aqap=qrpq=(rqqp)


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