## mathmath333 one year ago Probablity question

1. mathmath333

In a certain lottery 10,000 tickets are sold and ten equal prizes are awarded. What is the probability of not getting a prize if you buy (a) one ticket (b) two tickets (c) 10 tickets

2. Nnesha

lol 100% of not getting a prize for meh :P bad luck :P

3. welshfella

P(winning with one ticket) = 10/1000 = 0.001

4. mathmath333

so (a.) not winning a ticket =990/1000 ?

5. welshfella

9990/10.000 = 0.999

6. mathmath333

but 1-10/1000=990/1000

7. mathmath333

u earlier said P(winning with one ticket) = 10/1000

8. welshfella

its 10 over 10 thousand

9. welshfella

yea that was a mistake should be 10 / 10,000

10. mathmath333

ok

11. anonymous

yes there is a probability

12. anonymous

it's c

13. anonymous

probability not getting prize is 10/10,000

14. kropot72

If you buy 2 tickets, the probability of not getting a prize is given by $\large \frac{9990C2}{10000C2}=0.998$ If you buy 10 tickets, the probability of not getting a prize is given by $\large \frac{9990C10}{10000C10}=0.99$