Evaluate P(4,2)+C(5,3)?

Answer 1

p(4,2) = 4! / (4-2)! = 12

C(5,3) = 5! / [3! (5-3)!] = 10

Answer 22

NOTE
As Kenneth said, I'm also accustomed to nPr, but since I saw people in here writing P (n,r) I started doing that myself. I think C(n,r) is the way you would write it in computing.

Answer 2

Evaluate P(4,2)+C(5,3)
Really hard to understand what you are asking. At 1st glance it looks like you are asking for the sum of two points. But that makes nos sense.

So maybe you are talking about 4P2 + 5C3 which is the sum of a permutation and a combination. If so, its 4!/(4-2)! -5!/3!2!.

If that's not it, I give up.

Answer 3

The usual form for permutations and combinations should be nPr and nCr.
The permutation value is 4*3 meaning 12
The combination value is 5!/(2!*3!) or 5*4/2*1, which is 10
12+10 is 22
12+10=22
The schools might have taught it wrong. My teacher showed me the same thing a few weeks back, but I'm pretty sure the universal way to write is nPr and nCr

Answer 4

Twelvety