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Question

The fourth, seventh and tenth terms of a G.P. are p,q and r respectively, then

A
p2=q2+r2
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B
q2=pr
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C
p2=qr
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D
pqr+pq+1=0
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Solution

The correct option is B q2=pr
Let the first term of the G.P. is a and the common ratio is x
Now according to question
ax3=p , ax6=q , ax9=r
Now by observing the equations we can conclude that
q2=a2x12=pr

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