document.write( "Question 1195859: Please help with the homework:
\n" ); document.write( "1.A jar has 7 red marbles,4 black marbles and 1 white marble. Suppose each marble has an equal chance of being picked from the jar.
\n" ); document.write( "1.1. find the probability that a black marble is picked?
\n" ); document.write( "1.2. what is the probability of picking a red and a white marble? \n" ); document.write( "

Algebra.Com's Answer #828442 by math_helper(2461) $\"\"$ $\"About$

You can put this solution on YOUR website!


\n" );
document.write( "1.1.  On ONE pick, Pr(black) = 4/(7+4+1) = 4/12 = 1/3\r
\n" );
document.write( "\n" );
document.write( "1.2.  On TWO picks without replacement,  
\n" );
document.write( "         Pr(Red and White) = (7/12)*(1/11) + (1/12)*(7/11) = 14/132 = 7/66 \n" );
document.write( "

\n" );