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Let the positive numbers `a , b , c , d` be in AP. Then `a b c ,a b d ,a c d ,b c d` are (2001, 1M) not in AP/GP/HP (b) in AP in GP (d) in HP

A

Not in A.P/G.P/H.P.

B

in A.P.

C

in G.P.

D

in H.P.

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The correct Answer is:
D
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