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the first person choose 2 out of 10
the second person choose 1 out of 9
that is the difference
what do you mean by "it is not ended"? it is ended THE MOMENT you add one more person in. then the problem changed into something completely different: "whats the probability that one can pick a prize out of nine door?" it is no longer concerned with previous numbers
for the first person:
yes, the first time, he picks 1/10
the secon time he picks 1/9
IN TOTAL: he picks 2/10
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