There are 5 chemistry, 6 physics, and 7 math teachers in a school. if 3 teachers are selected randomly, find the probability that at least one is a math teacher.

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01-07-2018
Mathematics

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There are 5 chemistry, 6 physics, and 7 math teachers in a school. if 3 teachers are selected randomly, find the probability that at least one is a math teacher.

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itsai7376p74zuj itsai7376p74zuj · Answer 1 · 2018-07-01T18:26:24+02:00

itsai7376p74zuj itsai7376p74zuj

01-07-2018

77.2%

To find the probably and at least on you must find the probability of none and subtract from one.

The probability of none can be found like so:

(5+6 over 5+6+7)^3 = .228

1 - .228 = .772

Hope this helps!

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