SOLUTION: Lucky downs runs n exact each evening. To win, a better must select the first two horses in order. Seven horses compete in each race. Im being told to use one of the counting rules

Algebra.Com
Question 468988: Lucky downs runs n exact each evening. To win, a better must select the first two horses in order. Seven horses compete in each race. Im being told to use one of the counting rules to determine the number of winning pairs of numbers that can occur and to show formula and work...IM STUMPED..
Answer by stanbon(75887)   (Show Source): You can put this solution on YOUR website!
Lucky downs runs aan exact each evening. To win, a bettor must select the first two horses in order. Seven horses compete in each race. Im being told to use one of the counting rules to determine the number of winning pairs of numbers that can occur and to show formula and work.
---
There is only one winning pair.
There are 7C2 = (7*6)/(1*2) = 21 pairs
---
Probability of picking the winning pair = 1/21
=================
Cheers,
Stan H.
---
RELATED QUESTIONS

five horses compete in a race how many selection are there of the first two horses to... (answered by jrfrunner)
Five horses compete in a race. How many selections are there of the first two horses to... (answered by jrfrunner)
Rick is at a horse race and decides to predict the exact order in which the horses will... (answered by Theo)
A bettor at a race track wants to place a single $2 “win” bet on each of the nine races. (answered by Boreal)
In horse racing, a trifecta is a bet for which you must pick the first, second and third... (answered by ikleyn)
At most horse racing tracks, the "trifecta" is a particular race where you win if you... (answered by stanbon)
Good afternoon, Please help me? If there are 12 horses in a race what are the odds of... (answered by math_tutor2020,ikleyn)
At a horse race with a field of 10 horses. How many ways are there to select the first 3... (answered by ikleyn)
A gambler places a bet on a horse race. To win, she must pick the top three finishers in... (answered by FrankM)