Question

help write java s= 1!+2!+3!+.....n!

Answer 1

observe \(1!+2!+3!=1+2(1+3)\), \(1!+2!+3!+4!+5!=1+2(1+3(1+4(1+5)))\), etc.

Answer 2

this suggests a simple iterative approach

Answer 3

can u write example in java

Answer 4

okay:

static int factsum(int n) {
int v = 1;
while (n > 1) {
v = 1 + n-- * v;
}
return v;
}

Answer 5

http://ideone.com/to3bzf