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which of the following demonstrates how the first 21 on the left side of the triangle is calculated using the combination pattern?
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which of the following demonstrates how the first 21 on the left side of the triangle is calculated using the combination pattern?

which of the following demonstrates how the first 21 on the left side of the triangle-example-1
User Eirik H
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5 votes

Answer:

d

Explanation:

User Luso
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