document.write( "Question 69699: A penny ,a nickel and a dime are tossed simultaneously. What is the probability that exactly 2 of the coins show heads when they land? \n" ); document.write( "

Algebra.Com's Answer #49649 by venugopalramana(3286) $\"\"$ $\"About$

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A penny ,a nickel and a dime are tossed simultaneously. What is the probability that exactly 2 of the coins show heads when they land?
\n" ); document.write( "probabilty of head or tail coming up for each coin = 0.5
\n" ); document.write( "since 3 coins are different,the total number of possibilities =2*2*2=8
\n" ); document.write( "we need any 2 to come up heads and the other to come up tail.
\n" ); document.write( "selecting 2 for heads can be done in 3C2=3 ways.
\n" ); document.write( "probability =3/8
\n" ); document.write( "alternately we can find probability by
\n" ); document.write( "3 ways *p of head * p of head * p of tail = 3*(1/2)*(1/2)*(1/2) \n" ); document.write( "

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