Question

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

Answer 1

50% probability that it is odd, 50% probability it is even.

Answer 2

since the last number is all that counts, 4 numbers are odd, 4 are even, so its 50% odd as well.