Posted by Lorna on Sunday, November 25, 2012 at 8:41am.
Abag contains 11red beads 4 green beads 1 purple bead. Two beads are drawn without replacement in the bag. A). Calculate probability ttwo beads are same colour. And. B) calculate probability purple bead is not taken.

Probability  Writeacher, Sunday, November 25, 2012 at 8:48am
You'll get better results if you follow directions and put the SCHOOL SUBJECT in that box, not the name of your school.

Greenhill  Reiny, Sunday, November 25, 2012 at 12:28pm
a) could be either RR or GG
prob(RR = (11/16)(10/15) = 11/24
prob(GG) = (4/16)(3/15) = 9/20
prob(2 same colour) = 11/24 + 9/20 = 109/120
prob (one purple , one none) = (1/16)(15/15) + 15/16)(1/15) = 1/8
prob(NOT a purple) = 1  1/8 = 7/8
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