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Q.

If a : b : : c : d, then ____.

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a

ab = cd

b

ad = bc

c

a=b

d

ac = bd

answer is A.

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Detailed Solution

If two ratios are in proportion ie., a : b : : c : d then the product of the extremes is equal to the product of the means ad=bc. 

This is called the proportionality law. 

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