alleryStart learning →Which of the following is a complete list of the positive factors of 60?
A1, 2, 3, 4, 5, 6, 10, 15, 30, 60
B1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60
C2, 3, 4, 5, 6, 10, 12, 15, 20, 30
D1, 2, 3, 5, 6, 10, 12, 15, 20, 60
Answer & Solution
Correct answer: B. 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60
Pair the divisors: $1 \times 60$, $2 \times 30$, $3 \times 20$, $4 \times 15$, $5 \times 12$, $6 \times 10$. That gives 12 positive factors: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60.
Option A misses 4, 12 and 20. Option C omits 1 and 60 (every positive integer has itself and 1 as factors). Option D drops 4.
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