Question

Ifa =(1 , 2 , 3 , 4 , )andb=( 3 , 4 , 5 , 6 , 7 ) find (1) ,aub( 2)a-b,(3)b-a

Answer 1

Step-by-step explanation:

A = {1, 2, 3, 4} B = {3, 4, 5, 6, 7}

A U B = {1, 2, 3, 4, 5, 6, 7}

A - B = {1, 2}

B - A = {5, 6, 7}

Answer 2

Question:

If A = { 1 , 2 , 3 , 4 } and B = { 3 , 4 , 5 , 6 , 7 }

Find (1) A∪B , (2) A - B , (3) B - A .

Answer:

A∪B = { 1, 2 , 3 , 4 , 5 , 6 , 7 }

A - B = { 1 , 2 }

B - A = { 5 , 6 , 7 }

Given:

A = { 1 , 2 , 3 , 4 }

B = { 3 , 4 , 5 , 6 , 7 }

Step-by-step explanation:

(1) A∪B = { 1 , 2 , 3 , 4 } ∪ { 3 , 4 , 5 , 6 , 7 }

A∪B = { 1, 2 , 3 , 4 , 5 , 6 , 7 }

(2) A - B = { 1 , 2 , 3 , 4 } – { 3 , 4 , 5 , 6 , 7 }

A - B = { 1 , 2 }

(3) B - A = { 3 , 4 , 5 , 6 , 7 } – { 1 , 2 , 3 , 4 }

B - A = { 5 , 6 , 7 }