a three digit number is made using the digits 0,5,7 (without repetition of digit). if a number among them is selected at random , what is the probability that the no. will be 
a.multiple of 5
b.multiple of 9
c.will end with 7

since it is a three digit number, they can only be the fol:
507, 705, 750, 570 (you cant have zero in the beginning as it becomes a 2 digit number)

p (a) = 3/4
P (b) = 0/4=0
p (c) = 1/4

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