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If a,b,c,d ar all real numbers and `(a^(2) +b^(2)) d^(2)-2(a+c) bd + (b^(2) +c^(2))=0,` then a,b,c are in -

A

G.P.

B

A.P.

C

H.P.

D

none of these

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The correct Answer is:
A
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