document.write( "Question 1178924: A lot contains 20 electric bulbs 5 of which are defective. In how many ways can 4 bulbs be taken for inspection such that:
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Algebra.Com's Answer #808417 by ewatrrr(24785)\"\" \"About 
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document.write( "20 bulbs: 15(good)  5(def)\r\n" );
document.write( "4 BULBS TAKEN:\r\n" );
document.write( "ways..\r\n" );
document.write( "a. no defective electric bulb is included? (15C4)(5C0)\r\n" );
document.write( "b. 2 of the defective bulbs are included? (15C2)(5C2)\r\n" );
document.write( "c. all of the defective bulbs are included? (5C4)(15C0)\r\n" );
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document.write( "Wish You the Best in your Studies.\r\n" );
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