Probability - tickets

What is the probability when you have 25 tickets in 5000 that you not wins the first (one) prize?

Correct result:

p =  99.5 %

Solution:

p=100 (125/5000)=1992=99.5%p=100 \cdot \ (1-25/5000)=\dfrac{ 199 }{ 2 }=99.5 \%



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Showing 1 comment:
#
Math student
hello there,

I would like to ask because is not so clear at least to me, why is not 1/200 and it is 199/200 the correct solution?

Regards
Katerina

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