probability, Mathematics

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There are 20 defective bulbs in a box of 100 bulbs.if 10bulbs are choosen at random then what is the probability of there are just 3defective bulbs

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Example of factoring quadratic polynomials, Factor following polynomials. ...

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Find the least and greatest number of coins, Marc goes to the store with ex...

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Trigonmetry, [3+tan20+tan80]/tan20+tan80

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