from 6 white balls and 7 black balls probability that 2 balls drawn at random are of the same color?

• 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
• 13 years agoHelpfull: Yes(42) No(10)
• 6c2/13c2+7c2/13c2
• 13 years agoHelpfull: Yes(23) No(3)
• (6c2 + 7c2)/13c2= 43/91 is the ans
• 13 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)