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666isabella666
17.07.2019 •
Mathematics
For mr. fujimoto's class, there are 7 possible assignments. however, students only have to choose 5 assignments to complete and submit. if the order in which the students submit the assignments doesn't matter, how many different combinations of 5 are there?
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Ответ:
The formula for combinations is
C=n!/[(n-r)!*r!]
where
n is the total number of objects you choose from
r is the number that you choose to arrange
in this problem
n=7 assignments
r=5 assignments
C=7!/[(7-5)!*5!]> C=7!/[2!*5!]---> (7*6*5!)/(2*5!)> C=21
the answer is
21
Ответ:
6 pencils in each group
Step-by-step explanation:
Total = 88
Gave away = 46
Balance = 88 - 46 = 42
Divided into 7 groups, means : 42/7 = 6
So each group has 6 pencils