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Question

If a,b,c be in A.P. and b,c,d be in H.P., then


A

ab = cd

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B

ad = bc

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C

bc = ad

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D

abcd = 1

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Solution

The correct option is C

bc = ad


Given that a,b,c in A.P. and b,c,d in H.P.

So, 2b = a + c and c = 2bdb+d

c(b + d) = 2bd = (a + c)d bc = ad.


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