document.write( "Question 1204335: A sample of 4 different calculators is randomly selected from a group containing 18 that are defective and 40 that have no defects. What is the probability that at least one of the calculators is defective? \n" ); document.write( "

Algebra.Com's Answer #840504 by ikleyn(52782) $\"\"$ $\"About$

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document.write( "The total set is 40 + 18 = 58 calculators.\r\n" );
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document.write( "The probability that no one of 4 calculators is defective is\r\n" );
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document.write( "     = 0.215405284.\r\n" );
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document.write( "The probability that at least one calculator is defective is the complement to it\r\n" );
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document.write( "    P = 1 -  = 1 - 0.215405284 = 0.784594716.\r\n" );
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document.write( "ANSWER.  The probability that at least one calculator is defective is  0.7846  (rounded).\r\n" );
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