document.write( "Question 884041: If a student can solve one of 4 problems. If he attempts 4 questions in succession. What is the probability that at least one of them is right? \n" ); document.write( "

Algebra.Com's Answer #533955 by Fombitz(32388) $\"\"$ $\"About$

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First find the probability that all of them are wrong.
\n" ); document.write( " $\"P=%283%2F4%29%283%2F4%29%283%2F4%29%283%2F4%29=81%2F256\"$
\n" ); document.write( "The probability of at least one right plus the probability of all wrong must sum to 1.
\n" ); document.write( " $\"81%2F256%2BP%281R%29=1\"$
\n" ); document.write( " $\"P%281R%29=256%2F256-81%2F256\"$
\n" ); document.write( " $\"P%281R%29=175%2F256\"$ \n" ); document.write( "

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