a drawer holds 4 red hats n 4 blue hats. what is the probability of getting exactly 3 red hats or exactly 3 blue hats when taking out 4 hats randomnly out of the drawer n immediatly returning evry hat to the drawer b4 taking out the next!??

1/2
1/8
1/4
3/8

• suppose there are 4 red balls r1,r2,r3 and r4 and there are 4 blue balls b1,b2,b3 and b4
  so total arrangements are 16
  now if we take only 3 red balls and 1 blue balls,then there are total 4 arrangements
  and same for in case of blue here are total 4 arrangements,so total are 8 arrangements
  probability of getting exactly 3 red hats or exactly 3 blue hats when taking out 4 hats randomnly out of the drawer n immediatly returning evry hat to the drawer b4 taking out the next is 8/16=1/2(ans)
  
  
• 11 years agoHelpfull: Yes(19) No(4)
• The order is also important here. RRRB or BBBR.
  RRRB has 4 possible arrangements and BBBR too. So a total of 8 arrangements. For each of these arrangements p=1/16 so
  Ans = 8/16 = 1/2
• 11 years agoHelpfull: Yes(3) No(4)
• (4c1/8c1)*(4c1/8c1)*(4c1/8c1)*(8c1/8c1)
  =1/8
• 9 years agoHelpfull: Yes(3) No(2)
• (r,r,r,b)+(r,b,r,r)+(r,r,b,,r)+(b,r,r,r,)
  hence 4/8 is ans
  =1/2
• 11 years agoHelpfull: Yes(2) No(7)
• 1/2 is ans
  
• 11 years agoHelpfull: Yes(1) No(9)