Question

if AB disjoint sets such that n(A)=5 and n(AUB)=9 then n(B)=​

Answer 1

Answer:

if the A &B are Disjoint set then n(A^B)=0

n( AvB)= n(A)+n(B)- n(A^B)

9=5+n(B)-0

n(B)=4

Note ::

^ = intersection

v = Union

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