There are 7 students in a class: 5 boys and 2 girls.
If the teacher picks a group of 3 at random, what is the probability that everyone in the group is a boy?

2/7

Step-by-step explanation:

1. You have to find the probability that a boy will be picked three diferent times

2. # of boys/total #of students

3. 5/7

4. Now that one boy is picked, there is only a total of 6 students left and only four boys so your proportions change

5. 4/6

6. Now there is only 5 students left and 3 boys left

7. 3/5

8. Multiply these proportions together

9. 5/7 times 4/6 times 3/5 = 2/7

2/7

Step-by-step explanation:

khan academy

54

step-by-step explanation:

7! = 7×6×5×4×3×2

3! = 3× 2

as 7! is multiple of 3! because 7! contains 3! that is 3× 2 as factor

so 7! /(3! ) = 7× 6× 5× 4

= 42 × 20

= 840

its b) 840✌✌✌

dhruv⭐