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

75 tickets have been sold so far.

step-by-step explanation:

in this question it is clearly mentioned that 45 children's tickets have been sold and this number is 60% of the total tickets sold.

now let's assume the total number of tickets sold be x.

then 60% of x = 45

⇒

⇒ x(.6) = 45

by dividing with .6 on both the sides of the equation

⇒ x = 75

therefore 75 tickets have been sold so far.

i need more details

step-by-step explanation: