1)A bag contains five white, six red and seven blue balls. If three balls are selected at random, without replacement, find the probability they are:

-All different colors

2)A four digit number(with no repetitions) is to be formed from the set of numbers (0,1,2,3,4,5,6,7). Find the probability that the number:

a)is even

b)is odd

c)is less than 4000

d)is less than 4000, given that it is greater than 3000