4 years ago

Which is a cheap replenishable source for electric power?

2 answers:

Yanka [14]4 years ago

7 0

Moving water "hydroelectric" is a cheap replenishable source for electricity

5 0

watter is a cheap <span>moving </span>replenishable source for electric power

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Answer:

The probability that all the officers are women is $\frac{56}{1140}$

Explanation:

Given a committee consisting of 8 women and 12 men, from which 3 committee members are to be chosen as officers from a committee.

The total number of committee members is 8 + 12 = 20 members

C(n,r) = $\frac{n!}{r!(n-r)!}$ which represents the number of combinations of taking r objects out of n.

The probability that all the officers are women = C(8,3) / C(20,3)

= $\frac{8!}{3!(8-3)!} / \frac{20!}{3!(20-3)!}$

= $\frac{8!}{3!5!} /\frac{20!}{3!17!}$

= $\frac{56}{1140}$

Therefore the probability that all the officers are women is $\frac{56}{1140}$

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