chapter 20 #1

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There are 10 babies, 6 children and 8 adult. What is the probability to choose 6 babies, 4 children and 3 adult

(10C6 * 6C4 * 8C3) /(24P13) (10P6 * 6P4 * 8P3) /(24P13) (10P6 * 6P4 * 8P3) /(24C13) (10C6 * 6C4 * 8C3) /(24C13)

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1 solution

Samantha Hsia
Feb 25, 2015

probability= number of desired/total possible number

we need to choose 6 childern from 10 childern, and also it's a combination question. So it should be 10C6.[same for the childern and the adult]

Then use 10C6 to multiplied by 8C3 and 6C4.

total possible number is 24C13. 24 is come from the total of the babies, childern and adult (10+6+8), and then choose (6+4+3) people from the total of 24 people.

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