Question

. v3

Answer 1

Can you make equations haha?

Answer 2

Or, how about the quadratic equation, can you make it do that?

Answer 3

```
import java.util.Scanner;
public class PermutationTest{

public static void main(String[] args) {
int k, n;
Scanner input = new Scanner(System.in);
System.out.print("n: ");
n = input.nextInt();
System.out.print("k: ");
k = input.nextInt();
System.out.println(String.format("%d permute %d = %d", n, k, permute(n,k)));
}

public static int permute(int n, int k) {
int result = 1;
for (k = k+1; k <= n; k++) {
result *= k;
}
return result;
}
}

```

Answer 4

how would you change this program to do quadratic equation?

Answer 5

No clue :d

Answer 6

How would you change it to give you combination, like n choose k?

Answer 7

"%d permute %d = %d

Answer 8

Maybe change that?

Answer 9

my permutation formula is incorrect!

Answer 10

Yeah, I was confused it wasn't working lol

Answer 11

So, how would you try to fix it?

Answer 12

um

Answer 13

Which lines of code do you not understand?

Answer 14

ask about one line at a time.

Answer 15

Well I thought something might be missing here,
n = input.nextInt();

Answer 16

such as?

Answer 17

The formula for permutations is: \[\Large
^nP_k = \prod_{i=n-k+1}^ni
\]

Answer 18

What ever you want to put for n and k

Answer 19

Note that \[\Large
n! = \prod_{i=1}^ni
\]In short, \(n! = ^nP_n\).

Answer 20

batman, does it not let you enter a number?

Answer 21

Yeah it does lol

Answer 22

anyway... you haven't asked any question.

Answer 23

That's because I'm still experimenting lol, I'm not exactly sure what I'm doing yet.

Answer 24

Alright, think I'm done with this for tonight, thanks @wio @Kainui @tanya123