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Karo-lina-s [1.5K]
3 years ago
9

Use known facts of 9x5

Mathematics
1 answer:
snow_tiger [21]3 years ago
7 0
9 x 5 = 45 and 9 x 50 = 450
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Answer:

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Step-by-step explanation:

The order in which the cashiers and the kitchen crews are selected is not important. So we use the combinations formula to solve this question.

Combinations formula:

C_{n,x} is the number of different combinations of x objects from a set of n elements, given by the following formula.

C_{n,x} = \frac{n!}{x!(n-x)!}

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T = C_{10,2}*C_{15,4} = \frac{10!}{2!(10-2)!}*\frac{15!}{4!(15-4)!} = 45*1365 = 61425

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