Question

If n (A) =3 and n (B) = 6 and ACB, then n(AUB) =?
a. 9
b. 3
C 6
d. none of these
please explain and answer...its urgent ​

Answer 1

Answer: c) 6

Step-by-step explanation:

n(A) = 3

n(B) = 6

It is given that A is a subset of B which means that all elements of A are present in B.

n(A∪B) = n(A) + n(B) - n(A∩B) ----------- [ As A⊂B ]

             = 3+6 - 3 = 6

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