Mathematics, 15.12.2021 18:30 hooplikenari

Please help! 50 points 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.

Please help! 50 points

An algebra class has 21 students who all participate in a welcome activity

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Please help! 50 points An algebra class has 21 students who all participate in a welcome activity...

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