box contains 90 discs .
find the probability that it bears a perfect square number
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Favorable condition possiblity of a prime number less than 23= { 2,3,5,7,11,13,17,19}=8. Therefore probability of a prime number less than 23 = 8/90 = 4/45. = {1,4,9,16,25,36,49,64,81} = 9. Therefore probability of a perfect square number= 9/90 = 1/10.
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