5. Answers For Set Problems

What Are Sets?

A={Even Whole Numbers Between 1 and 11}

A={2,4,6,8,10}

Is 6 ∈ A?

Yes 6 ∈ A as 6 is an even whole number between 1 and 11.

Is 8 ∉ A?

No, 8 ∉ A is a wrong statement. This is because 8 is an even whole number between 1 and 11. So 8 ∈ A.

Union and Intersections

A={2,5,6,8,10,23,67,88,101,134}

B={1,6,7,10,34,67,76,96,101,155}

Write the set for A Union B.

A ∪ B = {1,2,5,6,7,8,10,23,34,67,76,88,96,101,134,155}

Write the set for A Intersect B.

A ∩ B = {6,10,67,101}

Venn Diagrams

A intersect B

B intersect (A union C)

Cartesian Product

Which of the following pairs is NOT an element in D x E ?

1. (6,13) 2. (9,7) 3. (10,15) 4. (1,22)

Answer: Number 3. (10,15)

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