Free Practice Question
PS · Problem Solving
sub-505
Combinations
In a task, 10 people need to be grouped into pairs. What is the total number of unique pairs that can be formed?
Answer Choices
Correct answer marked belowA
10
B
20
45
Correct
D
90
E
100
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Explanation
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Official Explanation
Official
In this scenario, we need to determine how many unique pairs can be formed from 10 individuals. The formula for combinations is used here,…
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Comments
2
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B
bharadwajNov 4, 2024
Thank for sharing!!!
J
JimJan 29, 2024
Can you explain more?
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
sub-505
Type
PS
Category