252 can be expressed as a product of primes as_______________?
Correct answer: A. 2 * 2 * 3 * 3 * 7
- A. 2 * 2 * 3 * 3 * 7
- B. 2 * 2 * 2 * 3 * 7
- C. 3 * 3 * 3 * 3 * 7
- D. 2 * 3 * 3 * 3 * 7
Explanation
Divide 252 successively by its prime factors: 252 = 2 x 126 = 2 x 2 x 63 = 2 x 2 x 3 x 3 x 7. Therefore its prime factorisation is 2 x 2 x 3 x 3 x 7. The likely wrong option is 2 x 2 x 2 x 3 x 7, whose product is 168, not 252.
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