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Proportions

If a, b, c, d...

Question

If a, b, c, d are in proportion, then

(a) ab = cd
(b) ac = bd
(c) ad = bc
(d) None of these

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Solution

(c) ad = bc

$∵$ a, b, c and d are in proportion.

$∴$ a : b = c : d

$\Rightarrow \frac{a}{b} = \frac{c}{d} \Rightarrow a d = b c$

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