I know I posted this already but no one answered the questions!!!!!

Question

**************ANSWER THIS PLEASE!!!!
Two students are chosen at random from all 50 students.
Find the probability that
a) Both students walked
b) only one of the students walked

50 students total.
12 students travelled by car only
7 students travelled by bus only
5 students travelled by car and walked,but did not use a bus
10 students travelled by bus and walked,but did not use a car
3 students used all three forms of travel

Answer 1

18 of the 50 walked

probability that the first one walked = 18/50
now you pick a second out of a population of 49 of whom 17 walked
so
18/50 * 17/49 = 306/2450 = .125

Answer 2

prob first one walked, second did not = (18/50) (32/49) = .235
prob second one walked, first did not is the same
so
.235 * 2 = .47