In a network with N nodes, what's the maximum number of connections you can make?
eg N=2, gives 1 connection, N=3 gives 3, N=4 gives 6, N=5 gives 10, N=6 gives lots etc
I think it's sum of N-i from i=1 to N-1
How many when N=100?
Can I simplify this in terms of N only and what's the function called in maths and/or in Excel or google sheets?
Probably easy but it's been years since i did maths.