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An algebra class has 21 students who all participate in a welcome activity introducing themselves to each other in pairs. One student wants to know how many introductions were made.

Fill in the values of n and r to complete the formula for finding the number of combinations of introductions.

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MrRoyal

The handshake is an illustration of combination, and the values of n and r are 21 and 2, respectively

How to determine the values of n and r?

The number of students in the class is 21.

This represents the value of n

i.e. n = 21

Each student shakes hand with another student (i.e. 2 students per handshake)

This represents the value of r

i.e. r = 2

Hence, the values of n and r are 21 and 2, respectively

Read more about combination at:

https://brainly.com/question/11732255

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