Question

Ryan’s mom randomly chooses two days each week for Ryan to do his chores. What is the probability that she picks Saturday and Sunday?

Answer 1

There are a total of 7C2 of options for Ryan's mom to choose.

If Ryan's mom picks Saturday and Sunday, this is the only 1 option in those 7C2 of options. Thus, the propability is (1 / 7C2) × 100% = 4.762%.

Answer 2

Probability that she picks Saturday and Sunday = 1/21 = 0.0476

Explanation:

Total number of days in a week = 7

Number of days selected = 2

Total number of combinations = 7C₂
`=(7*6)/(1*2) =21`

Total number of favorable ways = 1 that is Sunday and Saturday.

Probability that she picks Saturday and Sunday = 1/21 = 0.0476