4. are the numbers 21 , 14 , 3 and 2 in proportion ?
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Step-by-step explanation:
If a : b = c : d are in proportion then a/b = c/d
i.e. ad = bc
Product of extremes = Product of means
21 , 14 , 3 , 2
42 = 42
ad = bc
Hence 21 , 14 , 3 and 2 are in proportion
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