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ONLINE CLASS OF MATHEMATICS FOR
IX CLASS
TEACHER : SIR AHSAN
TOPIC : SET
Q1: If A = {1, 2, 3, 4, 5}
&
B = {3, 4, 5, 6, 7}
Prove that A Δ B = (A – B) U (B – A)
Solution:
A Δ B = (A – B) U (B – A)
Taking L.H.S
A Δ B = {1, 2, 3, 4, 5} Δ {, 3, 4, 5, 6, 7}
A Δ B = {1, 2, 6, 7}
Taking R.H.S
(A – B) U (B – A)
First we find (A – B)
A – B = {1, 2, 3, 4, 5} – {3, 4, 5, 6, 7}
A – B = { 1, 2 }
Than find (B – A)
B – A = {2, 3, 4, 5, 6, 7} - {1, 2, 3, 4, 5}
B – A = {6, 7}
Now,
(A – B) U (B – A)
(A – B) U (B – A) = { 1, 2 } U { 6, 7 }
(A – B) U (B – A) = {1, 2, 6, 7} answer
L.H.S = R.H.S
Hence proved

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a Delta B

  • 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 Δ B = (A – B) U (B – A)
  • 3. Solution: A Δ B = (A – B) U (B – A) Taking L.H.S A Δ B = {1, 2, 3, 4, 5} Δ {, 3, 4, 5, 6, 7} A Δ B = {1, 2, 6, 7}
  • 4. Taking R.H.S (A – B) U (B – A) First we find (A – B) A – B = {1, 2, 3, 4, 5} – {3, 4, 5, 6, 7} A – B = { 1, 2 } Than find (B – A) B – A = {2, 3, 4, 5, 6, 7} - {1, 2, 3, 4, 5} B – A = {6, 7}
  • 5. Now, (A – B) U (B – A) (A – B) U (B – A) = { 1, 2 } U { 6, 7 } (A – B) U (B – A) = {1, 2, 6, 7} answer L.H.S = R.H.S Hence proved