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WAEC Mathematics 2025 Paper

Question : 8

Total: 50

If R = {2, 4, 6, 7} and S = {1, 2, 4, 8} then R ∪ S equals

Solution:

Concept:

Union of two sets combines every distinct element from both sets, without repeating any element.

Explanation:

The given sets are

R = \{2, 4, 6, 7\}

and

S = \{1, 2, 4, 8\}

The union

R \cup S

contains all elements that belong to

R

or to

S

, or to both.

Write all elements of

R

first:

2, 4, 6, 7

Then add elements of

S

that are not already listed:

1

and

8

The elements

2

and

4

are already present from

R

, so they are not repeated.

Therefore,

R \cup S = \{1, 2, 4, 6, 7, 8\}

Answer:

Option A:

\{1, 2, 4, 6, 7, 8\}

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