mophead wrote:

How do you go from the (x-1)/10,000 to the next step?

I'm a tad lost...

Lets take 2 so probability is - 1/100 *

2-1/100

Lets take 90 - so probability is - 1/100 *

90-1/100

As we see for each number in the set we have the probability as

1/100 * (x-1)/100

Now all we have to do is to calculate 1/100 * (x-1)/100 for x = 1 to 100.

(x-1)/10000 = x/10000 - 1/10000

Solving for x = 1 to 100

(n(n+1)/2)/10000 - (1* 100)/10000 where n is 100.

(100*101/2)/10000 - 100/10000 => 4950/10000 => 99/200