alleryWhich of the following can be written as a rational p/q in lowest terms with q having ONLY 2 as a prime factor?
A1/3
B1/12
C1/8
D1/15
Answer & Solution
Correct answer: C. 1/8
1/8 = 1/2³ — denominator has only prime 2. 12 = 2² × 3 (has 3)
15 = 3 × 5 (has 3, 5) 3 = 3 (has 3).
Only 1/8 fits the criterion.
*Note: 1/8 = 0.125 (terminating decimal — predictable from this property).*
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