you will risk 2
Your 40 is 2 twenties so you get back 9 twenties plus your stake ie 220.
Sure, if by "plus" you mean concatenation. Otherwise, it's 2.
3+2h
2+
If you mean the sum of first n natural numbers then the formula is (n(n+1))/2 for example, 1+2+3+4+5=5*6/2=15
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