Latest IBM Aptitude Question SOLUTION: There are 15 homerooms in the school and 20 students in each homeroom. If the principal selects 5 of the homerooms for a pizza party, what is the probability of Mr. Smith's homeroo

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There are 15 homerooms in the school and 20 students in each homeroom. If the principal selects 5 of the homerooms for a pizza party, what is the probability of Mr. Smith's homeroom being selected?

Asked In IBM (12 years ago)

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Mukesh Tiwari  (11 years ago)

No. of ways for selecting 5 homerooms out of 15 = 15C5
No. of ways in which Mr. Smith's homeroom wont get selected = 14C5
Probability of not selecting Mr. Smith's homeroom = 14C5/15C5 = 14/15
Therefor probability of Mr. Smith's homeroom being selected = 1 - 14/15 = 1/15

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teja  (11 years ago)

515 *1/5=1/15

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