30 students has both brother and sister 21 student has brother, 16 has sister, 8 student has brother but no sister . How many student dies not have any brother or any sister

Answer 1

There are a total of 30 students in the group.

21 students have a brother.
16 students have a sister.
8 students have a brother but no sister.

To find the number of students who do not have any brother or any sister, we can subtract the total number of students who have a brother or a sister from the total number of students.

Total number of students who have a brother or a sister = 21 + 16 - 8 = 29

Therefore, the number of students who do not have any brother or any sister = Total number of students - Total number of students who have a brother or a sister
= 30 - 29
= 1

There is only 1 student who does not have any brother or any sister.