MathPLEASE HELP!!!
posted by Samantha .
Let's begin with a rather straightforward lottery in which players select four digits. The winning number is commonly selected in the following fashion: 10 Ping Pong balls (each with a digit 0 through 9 written on it) are placed in a hopper. One Ping Pong ball is selected. That digit now goes in the first place. That Ping Pong ball is put back in the hopper and the process is repeated three times.
What is the probability of picking a winning number?
Then suppose the Ping Pong ball was not replaced. Now what is the probability?

MathPLEASE HELP!!! 
Reiny
10 cases for 1st draw, 10 for the 2nd, 10 for the third, 10 for the 4th
prob = 1/10^4 = 1/10000
if ball is not returned
prob = 1/(10*9*8*7) = 1/5040
Respond to this Question
Similar Questions

Statistics and Probability
The TriState Pick 3 lottery game offers a choice of several bets. You choosea threedigit number. The lottery commision announces the winning threedigit number, chosen at random, at the end of each day. The "box" pays $83.33 if the … 
Physics
How much kinetic energy does a 1 kg ball have if it has a velocity of 10 m/s? 
physics
Donald Duck and his nephews manage to sink Uncle Scrooge's yacht (m = 4843 kg), which is made of steel (ρ = 7850 kg/m3). In typical comicbook fashion, they decide to raise the yacht (which is now on the bottom of a lake) by filling … 
physics
Donald Duck and his nephews manage to sink Uncle Scrooge's yacht (m = 4843 kg), which is made of steel (ρ = 7850 kg/m3). In typical comicbook fashion, they decide to raise the yacht (which is now on the bottom of a lake) by filling … 
MATH
Need Answer to the Following Please: Using the 9 digits, 1, 2, 3, 4, 5, 6,7, 8 and 9 you can arrange four different digits to form a fourdigit number that is NOT divisible by 7. The digits 1238 cannot be arranged to create a fourdigit … 
physics
Donald Duck and his nephews manage to sink Uncle Scrooge's yacht (m = 3527 kg), which is made of steel (ρ = 7850 kg/m^3). In typical comicbook fashion, they decide to raise the yacht (which is now on the bottom of a lake) by … 
math
suppose a lottery game allows you to select a 2digit number. Each digit may be either 1,2,3,4,5. if you pick the winning number you win $10 otherwise you win nothing A)what is the probability that you will pick the winning number … 
mathprobability
A state lottery has a daily drawing to form a fourdigit number. The digits 1 through 9 are randomly selected for each of the four digits. For each selection any one of the digits 1 through 9 are possible. What is the probability to … 
Math
A bag contains a set of ping pong balls numbered from 1 to 12. If you reach in and randomly pull out 3 of them, what is the expected value of the sum of the numbers on the 3 ping pong balls? 
Maths
Asmo is putting some ping pong balls into 10 boxes. In each of the boxes, number of ping pong balls shall not be less than 11, not equal to 17 and is not the multiple of 6. If the number of ping pong balls are different in each box, …