Out of the first 25 natural numbers two are chosen at random. The probability for one of the numbers to be a multiple of 4 and the other to be a multiple of 5 is

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29300

13100

9200

415

answer is A.

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Detailed Solution

L.C.M of 4,5 is 20 [254]=6,[255]=5,[2520]=15C1.4C1+(5+4)C125C2=29300

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