Urn A contains 3 red and 2 white marbles, Urn B contains 2 red and 5 white, an Urn is selected at random, a marble is drawn and put into the other Urn, then a marble is drawn from the second Urn,, probability that both marbles drawn are of same colour is ????

• (1/2*3/5*3/8) + (1/2*2/5*6/8) =21/80
• 10 years agoHelpfull: Yes(0) No(1)
• let A is the probability of select red marble from first ern,
  B is the '' '' '' '' '' '' second ern,
  probability to select one ern will be=1/2
  so whole probability will be=A(~B)+B(~A)=(1/2*2/5*3/8)+(1/2*2/7*4/6)=9/80+2/21
  so probability will be=.21,
  also if we do for white probability will be same
  
• 10 years agoHelpfull: Yes(0) No(1)
• Let Red coloured ball is selected from both.
  3/5 from A placed into B,
  Similarly, 2/7 from B placed to A
  Now,Let White coloured ball is selected from both.
  2/5 from A to B
  Similarly, 5/7 from B to A.
  So, P(RR) + P(WW)
  => (3/5) +*(2/7) + (2/5)*(5/7)
  => 16/35.ans..
• 7 years agoHelpfull: Yes(0) No(0)