1. have you ever borrowed money from a friend?
Least common multiple is both will multiply in to 30 but 10 will not multiply into 12.so the answer is 30
Combination Formula: (n = distinct objects, r = how many you pick) n!/(r!(n-r)!
So n = 7, r = 5
n! = 7! = 5040
R! = 5! = 120
(n-r) = 2! = 2
120*2=240
5040/240 = 21
21 combinations!
First convert the hours to minutes



now change the 900mins to seconds
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