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Of the three numbers, the first is tw...

Of the three numbers, the first is twice the second and the second is twice the third. The average of the reciprocal of the numbers is `7/(72)` . The numbers are: (a) 16, 8, 4 (b) 20, 10, 5 (c) 24, 12, 6 (d) 36, 18, 9

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