Free Practice Question
PS · Problem Solving
sub-505
Combinations
In a selection process for a school hallway monitor group, there are four boys and five girls available. If the group consists of all four boys and two girls, how many different groups can be formed?
Answer Choices
Correct answer marked below10
Correct
B
30
C
60
D
120
E
240
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Explanation
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Official Explanation
Official
Since all 4 boys must be included in the group, the task reduces to selecting 2 girls from a total…
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Comments
2
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S
SmritiDec 9, 2024
got this wrong on my practice
I
IarinaAug 1, 2024
Greatt
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