SOLUTION: Ten cards are numbered from 1-10. Three different cards are selected at random from these cards. What is the probability that the sum of the numbers is at most 9?. Th

Algebra ->  Probability-and-statistics -> SOLUTION: Ten cards are numbered from 1-10. Three different cards are selected at random from these cards. What is the probability that the sum of the numbers is at most 9?. Th      Log On

 

Hi,

3 cards sum at most 9

1, 2, 3 

1, 2, 4

1, 2, 5

1, 2, 6

Select 3 different cards from Ten cards numbered from 1-10. 

P(sum ≤ 9) =  = 4/120 = 1/30