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Question
Write the following set in roster form:
D = {x : x is a prime number which is divisor of 60}
Solution
D = {x : x is a prime number which is a divisor of 60}
| 2 | 60 |
| 2 | 30 |
| 3 | 15 |
| 5 |
∴ 60 = 2 × 2 × 3 × 5
The elements of this set are 2, 3, and 5 only.
Therefore, this set can be written in roster form as D = {2, 3, 5}.
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