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18-12-2018
Mathematics

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WILL MARK BRAINLIEST. Which of the following demonstrates how the first 21 (on the left side of the triangle) is calculated using the combination pattern?

WILL MARK BRAINLIEST Which of the following demonstrates how the first 21 on the left side of the triangle is calculated using the combination pattern class=

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Аноним Аноним

18-12-2018

Answer:

That would be C.

Step-by-step explanation:

7C2 = 7! / (7-2)! * 2!

7C2 = 7*6*5*4*3*2*1 / 5*4*3*2*1 * 2*1

= 7*6 / 2

= 21

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