The expression P(4, 3) is equal to:A. 3!B. 4!C. 1?
What is the value of the expression P(4, 3)?
A. 3!
B. 4!
C. 1
2 Answers
It sounds like you are asking about permutations. In other words, how many ways can you choose 3 items from 4 items in specific orders.
The formula is: nPr = n! / (n-r)!
In your notation, that would be P(n,r)
1. 4P3 = 4! / (4-3)! = 4! / 1! = 4! = 24
2. 7P1 = 7! / 6! = 7
3. 6! / 4! = 6! / (6 – 2)!
n = 6
r = 2
6P2 or P(6,2) in your notation.
If the question asks about “combinations” where order does not matter, the formula is
nCr = n! / (n-r)! / r!
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