alleryThe prime factors of thirty are two, three and:
ANine
BSeven
CTwelve
DFive
Answer & Solution
Correct answer: D. Five
1. Thirty factorises into primes.
2. Two and three account for six of it.
3. 2, 3 and 5 are the only prime factors of 30.
4. So the answer is five.
_Source: syllabus Mathematics, Ch 1 'Sets'_
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