Free Practice Question
PS · Problem Solving
505-555
Combinations
What is the total number of distinct products that can be formed by multiplying exactly 3 different numbers from the set {3, 5, 7, 13, 17}?
Answer Choices
Correct answer marked belowA
8
10
Correct
C
12
D
15
E
20
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Explanation
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Official Explanation
Official
The set contains five unique prime numbers. When selecting any three of these numbers, the resulting product will always be different. Thus, the number of…
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Comments
2
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N
NamanFeb 4, 2024
got this wrong on my practice
S
SaiApr 11, 2025
thanks
What this question tests
What it tests
Whether you can count arrangements and selections correctly — permutations vs. combinations.
Common trap
Overcounting: treating a selection as ordered when order does not matter, or forgetting to divide by duplicates.
Details
Difficulty
505-555
Type
PS
Category