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Probability
from 6 white balls and 7 black balls probability that 2 balls drawn at random are of the same color?
Read Solution (Total 6)
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- probability of drawing two black balls ->
(7/13)*(6/12) = 7/26
probability of drawing two white balls ->
(6/13)*(5/12) = 5/26
probability of drawing two balls of same color ->
7/26 OR 5/26
(7/26)+(5/26) = 6/13 - 14 years agoHelpfull: Yes(42) No(10)
- 6c2/13c2+7c2/13c2
- 14 years agoHelpfull: Yes(23) No(3)
- (6c2 + 7c2)/13c2= 43/91 is the ans
- 14 years agoHelpfull: Yes(10) No(18)
- ans - 6/13
let S be the sample space n(S)= 6+7= 13c2= (13*12)/(2*1)=78
let E be the event of getting same color , n(E)= (6c2)+ (7c2)=36
P(E)= n(E)/n(S)= 36/78= 6/13 - 10 years agoHelpfull: Yes(4) No(0)
- 6c2+7c2/13c2=6/13
- 10 years agoHelpfull: Yes(2) No(0)
- 3/13c2..............>Because if 25 balls are drawn from 7 and 2 that may be same color or not but after drawing third ball it definetly matches with any one of the color as drawn above..
- 8 years agoHelpfull: Yes(1) No(0)
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