There are 6 positive and 8 negative numbers. Four numbers are choosen at random and multiplied.the probability that the product is positive is:
(a)500/1001 (b)503/1001 (c)303/1001 (d)101/1001 (e)505/1001

• e) for positive number
  6c4/14c4 + (6c2*8c2)/14c4 + 8c4/14c4 =505/1001
  case1: only 4 positive no.
  case2: 2 positive and 2 negative no.
  case3: 4 negative no.
• 14 years agoHelpfull: Yes(26) No(1)
• (6c2*8c2+6c4+8c4)/14c4
  
• 14 years agoHelpfull: Yes(3) No(1)
• (6c2*8c2+6c4+8c4)/14c4= 505/1001
• 6 years agoHelpfull: Yes(1) No(0)
• plz tell me how 1404 is obtained for selecting of 4 balls from 14 balls is 14c4 na
  it shoult be 6006
• 13 years agoHelpfull: Yes(0) No(0)
• all four positive number = 6c4/14c4
  all four negative number = 8c4/14c4
  two numbers are positive and two are negative hencs probaility = 6c2*8c2/14c4
  hence required probability = 6c4+8c4+(6c2*8c2)/14c4
  15+70+15*28/1001
  505/1001
• 5 years agoHelpfull: Yes(0) No(0)