Free Practice Question
PS · Problem Solving
505-555
Combinations
A sequence is to be formed by arranging 8 letters. Four of the letters will be the letter E, two of the letters will be the letter F, one of the letters will be the letter G, and one of the letters will be the letter H. If each letter can only be used once, how many unique sequences can be created?
Answer Choices
Correct answer marked belowA
70
840
Correct
C
1,680
D
3,360
E
40,320
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Comments
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P
PrabalMay 21, 2024
still struggling with these types of problems
B
BriannaAug 4, 2024
Good question
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