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BECE Mathematics 2013 Paper

Question : 1

Total: 40

A=\{5,10,15,20,25,125\}

B=\{5,10,15,20,25,625\}

A \cup B

Solution:

Concept:

Union of two sets means collecting all elements present in either set, without repeating any common element.

Explanation:

Given:

A = \{5,10,15,20,25,125\}

and

B = \{5,10,15,20,25,625\}

The common elements in both sets are

5,10,15,20,25

The elements unique to

A

are

125

; the elements unique to

B

are

625

Combine all distinct elements:

\{5,10,15,20,25,125,625\}

This matches option D.

Answer:

A \cup B = \{5,10,15,20,25,125,625\}

Correct option: D.

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