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Question

If $$a, b, c, d$$ are in GP, then


A
ac=cd
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B
ab=cd
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C
bc=ad
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D
ad=bc
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Solution

The correct option is A $$ad = bc$$
Given  $$a, b, c, d$$  are in GP
$$\Rightarrow \cfrac{b}{a}=\cfrac{c}{b}=\cfrac{d}{c}$$
$$\Rightarrow bc=ad$$
Hence, option 'D' is correct.

Mathematics

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