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Question

If a1,a2,a3... are in A.P, then ap,aq,ar are in A.P 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


ap,aq,ar are in A.P
ap+ar=2aq
Let d be the common difference
a1+(p1)d+(a1+(r1)d=2(a1+(q1)d
2a1+(p+r)d2d=2a1+2qd2d
p+r=2q
p,q,r are in A.P


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