Question

15. In a class of 100 students 90 have taken
mathematics 70 have taken mathematics
but not biology. Find the number of
students who have taken biology but not
mathematics. Each student has taken either
mathematics or biology or both. *
O
30
O 10
15
20
timos Then the​

Answer 1

Answer:

n(M) = 90

n(M - B) = 70

so n(M n B) = 20

n(MUB) = 100

Using formula

n(MUB) = n(M) + n(B) - n(MnB)

100 = 90 + n(B) - 20

n(B) = 30

Now n(B - M) = 30 - 20 = 10

Answer 2

Answer:

this is correct....................