- Students in class are exchanging pencils.
1 student = 0 exchanges
2 students = 2 exchanges
3 students = 6 exchanges
4 students = 12 exchanges
how many exhcanges for 7 sutudents?
*I know the answer to be: 42 exchanges... but how to get it??? I knwo there is a formula, but I dont knwo how is it and how to use it..* help

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1 * 0 = 0
2 * 1 = 2
3 * 2 = 6
4 * 3 = 12
5 * 4 = 20
6 * 5 = 30
7 * 6 = 42

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