Question

if a,b are non empty sets that n(A) =17 ,n(B)=21 and n(AnB)=5then find n(AuB)​

Answer 1

Answer:

Step-by-step explanation:

We know that

n(A∪B)=n(A)+n(B)−n(A∩B)

Here we are given with

n(A)=7,n(B)=5,n(A∪B)=11

Substitute these values in the above formula.

11=7+5−n(A∩B)

⟹n(A∩B)=12−11=1

∴n(A∩B)=1

HOPE IT HELP...

Answer 2

Answer:

33

Step-by-step explanation:

n(A u B) = n( A) +n (B) - n(A n B)

n (A u B) = 17 +21 -5

n( A u B) = 33