AP BIOLOGY

HEREDITY

BASICS OF PROBABILITY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Mom and dad have four daughters, and each daughter has one brother. How many people are in the family?
A
3
B
2
C
4
D
7
Explanation: 

Detailed explanation-1: -Each of his daughters had a brother, but they all shared the same brother. Therefore, four daughters plus one brother = five children in total.

Detailed explanation-2: -If each of this daughters is sired by a different father, then it would mean that each daughter has the same parents with exactly one brother meaning that there would be a total of 7 daughters and 7 sons, with each daughter having one son as a brother and 6 step brothers.

Detailed explanation-3: -Harry had 4 daughter and it is also mentioned that each daughter had a brother. Hence, Mr. Harry had 4 daughters and only one son. i.e., 5 children in total.

Detailed explanation-4: -“Each daughter has a brother” means there is only 1 son overall, not 5 as many are claiming. If there were 5, that would mean each daughter had 5 brothers. That one brother has 4 kids.

Detailed explanation-5: -The most widely accepted answer to the riddle is Five. Mr and Mrs Smith have five children.

There is 1 question to complete.