Book Maths Puzzle

There are 10 prizes and 25 blanks in a lottery. If John has taken a lottery, what is the probability for him to get a prize?

Read Solution (Total 2)

10C1/35C1 =2/7
10 years agoHelpfull: Yes(2) No(0)

probability of getting prize =10C1/35C1=10/35=2/7
10 years agoHelpfull: Yes(1) No(0)

Book Other Question

Six persons enter a lift on the ground floor of a nine floor apartment. Assuming that each of them independently and with equal probability can leave the lift at any floor beginning with the first, what is the probability that all the six persons are leaving the lift at different floors? Find the number of numbers till 50000(less than 50k) whose sum of digits is 13.