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A page from a book containing 100 pages is opened at random. Find the probability that a doublet is found on the page.

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A book has 100 pages. If a page is opened at random, find the probability for the page to have a two digit number with the same digits.
A page is randomly selected from a book of 100 pages, then find the probability that the sum of the digits of the page is 10.
A box contains 400 bolts of which 20 are defective. Find the probability that a bolt chosen at random from the box is not defective.
A lot consists of 12 good products, 6 with minor defects and 2 with major defects. A product is chosen at random. The probability that it is not defective is
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