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1 * 0 = 0
2 * 1 = 2
3 * 2 = 6
4 * 3 = 12
5 * 4 = 20
6 * 5 = 30
7 * 6 = 42

but why S-1???

Nobody knows...

Because. The pattern shows that the number multiplied by the students is always one less than it.

still dont get it.. (sorry for the persistance..) i wanna learn math like for real..

So the formula is:
(S - 1) = N
S * N = X
S = Students
X = Exchanges
N = Number to multiple on "S".

yeah.. i get that... i just didnt know why N = S-1 ... but its ok tho... thanks man! :)

u are a really good helper :- )

I am waiting to help like Opcode. :-(

ahah...