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Question

If a1,a2,a3,.......... are in AP then ap,aq,ar are in AP if p,q,r are in:

A
A.P.
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B
G.P.
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C
H.P.
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D
None of these
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Solution

The correct option is A A.P.
If a1,a2,a3,...... are in AP
a2a1=a3a2 (equation 01)
a3a2=a4a3 (equation 02)
.
.
.
ap,aqand ar are in AP.
aqap=araq (equation 03)
Comparing equation 01,02 and 03
p,q,r are in AP

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