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Dmitriy789 [7]
3 years ago
15

At prom, Dina asks a boy to dance. A moment later, her friend decides to ask a boy to dance, too.

Mathematics
1 answer:
leonid [27]3 years ago
3 0

Answer:

Dina's friend is jealous of Dina's confidence so she wanted to "what up" her :)

Step-by-step explanation:

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Answer:

45

Step-by-step explanation:

The order in which the items are chosen 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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Combinations of 2 from a set of 10. So

C_{10,2} = \frac{10!}{2!(10-2)!} = 45

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