Posted by karlo on Tuesday, March 27, 2012 at 7:59pm.
there are 4 white balls and 6 red balls in a sack. If two balls are taken out successively ( the first ball is not replaced ) what is the probability that the balls are drawn are of different colors?

probability  bobpursley, Tuesday, March 27, 2012 at 8:12pm
pr= prob second white given first red, plus prob second red given first white.
pr= 4/9*6/10 + 6/9*4/10= 48/90

science  sajith, Sunday, July 22, 2012 at 11:46pm
A box contains 10 balls of which 6 are red (R) and 4 are white (W) . Three balls are taken from the box at random, one after the other. The probability that the 3 balls drawn are in the order RRW is equal to,

probability  uu, Monday, August 13, 2012 at 12:23pm
xdf_ghdf

probability  john, Thursday, April 18, 2013 at 12:02pm
tommy has 7 yellows 6 green 3 blues 8 red wht it tommy probability that she will not draw a green ball
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