Question

if A and B are two Disjoint sets with n(A)=4 and n(B)=2 then n(A-B)=???

Answer 1

Given that,

$n(A)=4$

$n(B)=2$

We know that,

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

So, $A\cap B=0$

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

Using formula for n(A-B)

$n(A-B)=n(A)-(A\cap B)$

Put the value into the formula

$n(A-B)=n(A)-0$

$n(A-B)=n(A)$

Put the value into the formula

$n(4-2)=n(4)$

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

Answer 2

Answer:

The Answer is 4

Step-by-step explanation:

n(A) = 4

n(B) = 2

As A and B are two disjoint sets, no common elements will be there.

Thus, from A, no elements in B will be subtracted.

So, n(A-B) = n(A) = 4

Hope it helps you :)