A bag contains 64 balls of 8 diff colors.There are eight of each color (including red).what is tha least number u hav to pick,with out looking ,to be sure of selecting 3 red balls

• 8C3/64C3
  selecting 3 out of 8 red balls so 8C3
  total possibility is 64C3
• 10 years agoHelpfull: Yes(27) No(5)
• 59
  total balls = 64
  red balls = 8
  now being sure of 3 red balls means (8-3)balls is to be present in the bag
  so 64-5=59
• 10 years agoHelpfull: Yes(25) No(7)
• I THINK 59 BALLS
  (BCZ,WE WANT 3 RED BALLS OUT OF 8 BALLS 3 NEED TO CHOOSE SO FOR 56 ATTEMPTS ALL COLORED BALLS CAME +3 ATTEMPTS BRING 3 RED BALLS SURELY)
• 10 years agoHelpfull: Yes(14) No(1)
• total balls 64..8 diff colors means ,each color has 8 balls
  8*8=64
  similarly we have 8 red balls
  now have to pick 3 red balls
  possibility of 3 red balls= 8C3/ 64C3= 1/744(probability)
• 10 years agoHelpfull: Yes(5) No(1)
• ans is 59
  taking the worst case scenario: getting pattern of 7 diff. color balls(not red)..
  this pattern repeats 8 times so 56 next we get 3 balls red simultaneously so 56+3 is 59
  
• 10 years agoHelpfull: Yes(3) No(0)
• 59 balls
  59 is the least number of balls u hav to pick, with out looking ,to be sure of selecting 3 red balls.
• 10 years agoHelpfull: Yes(2) No(1)
• clearly 59 is the no of attempts we require for getting out 3 red balls
  and probability for getting same is 8c3/64c3
• 10 years agoHelpfull: Yes(2) No(0)
• 59 is ans..
• 9 years agoHelpfull: Yes(1) No(0)
• total balls=64
  among 8 red balls we have to pick atleast 3
  so we without considering other colors we can leave 5 balls in the bag so we can get toatal 7 types of colored balls and three balls of remaining type....
  So we can pick 64-5=59 balls
  
  we can get minimum 3 red balls
• 10 years agoHelpfull: Yes(0) No(1)
• here it is clearly written that 8 balls of diff color including red
  
• 10 years agoHelpfull: Yes(0) No(0)
• answer is---13/39
• 10 years agoHelpfull: Yes(0) No(2)
• i think the ans will be 17 because when we pic 2 ball's of each color then the steps will be 16 , now when in 17th step the ball be red.
• 8 years agoHelpfull: Yes(0) No(0)