a student is free to choose only chemistry, only biology or both. if out of 32 students, chemistry has been choosen by 16 and biology by 25, then how many students have choosen biology but not chemistry
Answers
Answered by
2
Hey MATE...
Answer is simple 25 students have been choosen biology....
hope it will help you...
Answered by
18
A student is free to choose only chemistry, only biology or both. if out of 32 students, chemistry has been choosen by 16 and biology by 25, then how many students have choosen biology but not chemistry.
Total no = 32,
No of students opted chemistry = 16,
No of students opted bio = 25.
n(C) + n(B) - 32 = n(C intersects B)
=) 16+25 - 32 = n(C intersects B)
= 9 students ( it means 9 students choose bio and chemistry both).
So n(B-C) = 25 - 9
= 16.
Total no = 32,
No of students opted chemistry = 16,
No of students opted bio = 25.
n(C) + n(B) - 32 = n(C intersects B)
=) 16+25 - 32 = n(C intersects B)
= 9 students ( it means 9 students choose bio and chemistry both).
So n(B-C) = 25 - 9
= 16.
Similar questions