Count the possible combinations of 3 letters chosen from A, B, C, D. The possible combinations of 3 letters are __.
2 answers:
Answer:
Step-by-step explanation:
We are given the letters:
2
We write the possible permutations of 3 letters from the given list:
3
Because order is not important in a combination we cross out the duplicate pairs:
4
Answer:
4
Step-by-step explanation:
n! / r!(n-r)!
n = # of total objects
r = # grouped together at a time
4! / 3!(4-3)!
4
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