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