In: Statistics and Probability
Pick a subset of {1, 2, · · · , 10} so that any subset is equally likely to be picked. What is the probability that
a. the subset contains the element one, given it is of size
three?
b. the subset has no even numbers given that it is of size 4?
c. the maximum element of the subset is 8, given that the minimum
element in it is 3?
Like {3}, {3, 4}, {3, 5}, ..
Also number of subsets where minimum is 3 and maximum is 8 is as subsets are formed using the numbers
{3, 4,5,6,7,8,9,10} with 3 and 8 fixed.
Like {3, 8}, {3, 4,8}, {3, 5,8},....
Hence the probability is