Latest CAT Aptitude Question SOLUTION: A person starts multiplying consecutive positive integers from 20. How many numbers should he multiply before the will have result that will end with 3 zeroes?

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A person starts multiplying consecutive positive integers from 20. How many numbers should he multiply before the will have result that will end with 3 zeroes?

Asked In CAT MAN (10 years ago)

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SAURAV  (9 years ago)

5
when next no. i.e 25 is to be multiplied we get 3 zeros.so the feasiblible no is obtained when multiplied from 20to24

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Revanth  (8 years ago)

20 yields a zero, 22*24*25 yields 2 more zeroes. So 6 is the answer

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Sri Raksha Garalpad  (5 years ago)

20 * 21 * 22 * 23 * 24 * 25
20 * 21 * 22 * 23 * 24 * (5 * 5)
20 * 21 * 22 * 5 * 23 * 24 * 5
(even number multiplied with 5 yields zero that is 22 * 5 yields one zero and 24 * 5 yields another zero,there is already a zero in 20 ).Hence the number from 20 to 25 has to be multiplied to obtain 3 zeros.the answer is 6.

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