https://www.slideshare.net/AhsanRaza196

1. ONLINE CLASS OF MATHEMATICS FOR
IX CLASS
TEACHER : SIR AHSAN
TOPIC : SET

2. Q1: If A = {1, 2, 3, 4, 5}
&
B = {3, 4, 5, 6, 7}
Prove that A – B = A – (A⋂B)

3. Solution:
Taking L.H.S
A – B = {1, 2, 3, 4, 5} - {3, 4, 5, 6, 7}
A – B = {1, 2}

4. Taking R.H.S
A – (A⋂B)
First we find (A⋂B)
(A⋂B) = {1, 2, 3, 4, 5} ⋂ {3, 4, 5, 6, 7}
(A⋂B) = {3, 4, 5}

5. Now,
A – (A⋂B) = {1, 2, 3, 4, 5} – { 3, 4, 5}
A – (A⋂B) = {1, 2}
L.H.S = R.H.S
Hence proved