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Q.

a, b,c, d∈R+ such that a, b, c are in A.P. and b, c, d are inH.P. then :

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a

ab=cd

b

ac=bd

c

bc=ad

d

None

answer is C.

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Detailed Solution

b=12(a+c), c=2bdb+d ⇒    bc+dc=a+cd=ad+dc⇒           bc=ad
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