An algebra class has 21 students who all participate in a welcome activity introducing themselves to each other in pairs. One st

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1 year ago

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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 st

udent 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.

Mathematics

1 answer:

Nuetrik [128] · Answer 1 · 2023-02-20T00:12:16+03:00

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

<h3>How to determine the values of n and r?</h3>

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