The sum of two numbers is 2000 and their L.C.M. is 21879. Which of the following correctly represents the the two numbers?

1993, 7

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1991, 9

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1989, 11

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1987, 13

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1874, 5

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Solution

The correct option is C 1989, 11
From the given choices we can see that the L.C.M. of 1989 and 11 is 21879.
Therefore, required numbers are 1989, 11.

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