Question

7. Given n(E) = 25, n(A') = 7, n(B) = 10 and B C A Draw a Venn diagram to illustrate
this information. Hence, find the cardinal number of the set (A-B) ​

Answer 1

Answer:

n(A-B)=n(A)-n(B)=25-10=15

Step-by-step explanation:

n(A)=25

and n(A')=7

So n(U) =n(A) +n(A')=25+7=32

n(B)=10 and B ⊂ A

Thus n(A-B)=n(A)-n(B)=25-10=15