Abox contains 90 discs which are numbered from 1 to90 .If one disc is drawn at random frm the box, find the probability that it bears a two digit number less than 67
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90 - 1 =89 (one ball drop)
10 to 66 are two digit number less than 67
then , the probability is 57 / 89.
10 to 66 are two digit number less than 67
then , the probability is 57 / 89.
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