Test Index

BECE Mathematics 2015 Paper

Question : 1

Total: 40

List the members of the set Q = {Prime factors of 30}

Solution:

Concept:

Prime factors are prime numbers that divide the given number exactly.

Explanation:

Prime numbers have only two factors:

1

and the number itself.

Divide

30

by the smallest prime numbers until the quotient is

1

30 \div 2 = 15

15 \div 3 = 5

5 \div 5 = 1

So,

30 = 2 \times 3 \times 5

Thus, the prime factors of

30

are

2

3

, and

5

Answer:

Q = \{2, 3, 5\}

Correct option: A

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