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B
(72, 48, 24)
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C
(64, 40, 28)
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D
(81, 63, 45)
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Solution
The correct option is C (81, 63, 45) Each set consists of numbers which are obtained by multiplying a certain number by 9, 7 and 5 respectively. Thus, in the given set, 63=7×9,49=7×7,35=7×5. Similarly, 81=9×9,63=9×7,45=9×5.