A box contains 90 discs which are numbered from 1 to 90 if one disc is drawn at random from the box find the probability that it bears a) three digit number b) a perfect square number c) a number divisible by 10 d) the factors of 50
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a) 0
b) 9/90=1/10
c) 9/90=1/10
d) 2/90=1/45
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