Topcoder Srm 626 div2 500 problem

When I tried to solve this problem, I didn't exactly know about expected value.
know I can liite understand it

problem is get expected value if A value is larger than B

A. 2 sided
B. 2 sided

case is (2,1)
so expected value is 2

A. 4-sided
B. 2-sided

(4,1) (4,2) (3,1) (3,2) (2,1)
4+4+3+3+2 / 5 = 3.2

this is what i learn from this problem.


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