Probability

Thanx for the confirmatio, Chris.....I'm a little weak at probability and statistics, hence I did not include my calculations.....but they were correct (THIS time).....so I 'guessed'  ....  some day I will be up to speed !

48.7 percent?

P (two whie)  =  15/27 * 14/26  =   35/117

P(two black)  =  12/27 * 11/26  =    22/117

So....the total probability  =  [35 + 22]  / 117   =   57/117  = 19/39  ≈  48.7 %

P (two whie)  =  15/27 * 14/26  =   35/117

P(two black)  =  12/27 * 11/26  =    22/117

So....the total probability  =  [35 + 22]  / 117   =   57/117  = 19/39  ≈  48.7 %

Just as EP found.....!!!

a bag contain 15 white beads and 12 black ones. If i take two beads out of bag at random, one at a time and without replacing first, find probability thaat both are the same colour

To be honest, EP.....I'm not that great at those two areas, either......I learned a lot from Melody and Alan....!!!

P.S. .......  I like Omi's "tree−diagram" approach, too.....!!!!