1. Time yourself
2. Solve seperately
3. Write your solution here and please mention your time
Two girls have their birthdays in the same Week. It is known that one
of the girls was born on a Saturday. Determine the probability that both
were born on a Saturday.
Well, i think this got to everyone. The answer is 1/13.
We know that at least one person has a birthday on Saturday. So for the probability that both were born on a Saturday, i first list the possibilities of birthdays for both girls .
G1 - G2
Note, we do not know which girl's birthday is on Saturday. So, we have to fix Each girls birthday on Saturday at a time and then list out the rest of the possibilities.
We have 13 possible combinations. Of those thirteen possible combinations that fulfill the condition, only one
has two Saturdays, hence 1/13.