Free Practice Question
PS · Problem Solving
655-705
Combinations
How many different ways can 12 unique artworks be allocated between two collectors – Alice and Bob – ensuring that both collectors receive an even number of artworks? (All artworks must be distributed.)
Answer Choices
Correct answer marked belowA
128
B
256
C
512
D
1024
2048
Correct
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Explanation
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Official Explanation
Official
To determine the number of ways to distribute 12 unique artworks between Alice and Bob while ensuring both receive an even number, we start by noting that each artwork can be given to either collector. This results in a total of possible distributions. Since 12 is even, the…
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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
655-705
Type
PS
Category