This is a combination problem.
Given:
12 students
3 groups consisting of 4 students.
Mark can't be in the first group.
The combination formula that I used is: n! / r!(n-r)!
where: n = number of choices ; r = number of people to be chosen.
This is the formula I used because the order is not important and repetition is not allowed.
Since Mark can't be considered in the first group, the value of n would be 11 instead of 12. value of r is 4.
numerator: n! = 11! = 39,916,800
denominator: r!(n-r)! = 4!(11-4)! = 4!*7! = 120,960
Combination = 39,916,800 / 120,960 = 330
There are 330 ways that the instructor can choose 4 students for the first group
Answer:
5
Step-by-step explanation:
distribute the negative
5*3 + 5(-2)
15-10
5
I believe it is 1x - 9y + 41
Answer:
3y+1
Step-by-step explanation:
4y+3-y-2
3y+3-2
3y+1
Total pay before deductions is gross pay <==
total pay after deductions is net pay
