document.write( "Question 1178826: A bin contains 75 light bulbs, 5 of which are defective. If 5 light bulbs are randomly selected from the bin with replacements, find the probability that all the bulbs selected are good. Round to three decimal places as needed. What equation would I use to find the answer? \n" ); document.write( "

Algebra.Com's Answer #808239 by ikleyn(52810) $\"\"$ $\"About$

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document.write( "It means that you, actually, select your bulbs from the set of 70 good bulbs.\r\n" );
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document.write( "Therefore, you may find the probability as\r\n" );
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document.write( "    P =  = 0.70124  (rounded).    ANSWER\r\n" );
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document.write( "The formula says that you first select any of 70 good bulbs from the total of 75 bulbs;\r\n" );
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document.write( "then you select any of 69 remaining good bulbs from the total of remaining 74 bulbs;\r\n" );
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document.write( "    . . . and so on 5 times, in all, completing your selection.\r\n" );
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document.write( "If you are familiar with the notion/conception of COMBINATIONS, you may write the formula for probability in this way\r\n" );
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document.write( "    P = ,\r\n" );
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document.write( "which says that the total space of events contains    elements,\r\n" );
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document.write( "while the space of favorable events has   elements.\r\n" );
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document.write( "Both formulas produce the same value and the same answer.\r\n" );
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\n" ); document.write( "\n" ); document.write( "To learn the subject better by examples, look into the lessons\r
\n" ); document.write( "\n" ); document.write( " - Elementary Probability problems related to combinations \r
\n" ); document.write( "\n" ); document.write( " - Elementary Probability problems related to combinations REVISITED \r
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\n" ); document.write( "\n" ); document.write( "You will find a variety of similar (and different) solved problems there (!)\r
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