Question

if A and B are 2 disjoint set with n(A)=4 and(B)=2 then n(A-B)
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Answer 1

Step-by-step explanation:

Given that,

n(A)=4n(A)=4

n(B)=2n(B)=2

We know that,

A and B are disjoint sets, there are no common elements among A and B.

So, A\cap B=0A∩B=0

We need to calculate the value of n(A-B)

Using formula for n(A-B)

n(A-B)=n(A)-(A\cap B)n(A−B)=n(A)−(A∩B)

Put the value into the formula

n(A-B)=n(A)-0n(A−B)=n(A)−0

n(A-B)=n(A)n(A−B)=n(A)

Put the value into the formula

n(4-2)=n(4)n(4−2)=n(4)

Hence, The value of n(A-B) is n(4).

Answer 2

answer

4

Step-by-step explanation:

coz its disjoint set,, they have no common element

so,, n(A-B)=n(A)