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Zolol [24]
3 years ago
15

Please answer I’ll rate brainlyest

Mathematics
2 answers:
SOVA2 [1]3 years ago
4 0

Answer:

21

Step-by-step explanation:

The answer is 21, because we use the combinations formula

7!/(7-2!)(2!) = 6x7/2 = 21

svlad2 [7]3 years ago
3 0

For this case we have that by definition:

C (n, r) = \frac {n!} {r! * (n-r)!}

We have to:

n = 7\\r = 2

Substituting:

C (7,2) = \frac {7!} {2! * (7-2)!}

By definition:

7! = 7 * 6 * 5!\\2! = 2 * 1 = 2

Substituting:

C (7,2) = \frac {7 * 6 * 5!} {2 * 5!}\\C (7,2) = \frac {7 * 6} {2}\\C (7,2) = \frac {42} {2}\\C (7,2) = 21

Answer:

21

Option A

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