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lions [1.4K]
3 years ago
13

Timmy bought a skateboard and two helmets for a total of

Mathematics
1 answer:
Pie3 years ago
4 0
D-2h=cost of skateboard
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D

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3 years ago
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denis-greek [22]

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Option B

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\mathrm{n\:choose\:r},\\nCr=\frac{n!}{r!\left(n-r\right)!},\\\\\frac{9!}{3!\left(9-3\right)!} =\\\frac{9!}{3!\cdot \:6!} =\\\\\frac{9\cdot \:8\cdot \:7}{3!} =\\\frac{504}{6} =\\\\84\\\\Solution = Option B

Hope that helps!

8 0
3 years ago
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