A coin is tossed 4 times. What is the probability of getting heads exactly 3 times?

• Two possible combinations are
  HHTH,HTHH, HHHT and THHH.
  
  Probability of each case = 1/2*1/2*1/2*1/2= 1/16
  
  the probability of getting heads exactly 3 times= 4*1/16+ =1/4
• 13 years agoHelpfull: Yes(14) No(3)
• 16 combination is possible.
  4 ways to get 3 head,
  so 4/16=1/4:)
• 12 years agoHelpfull: Yes(6) No(1)
• 3/16(possibility of occuring events/Total number possibility of events)
  
  
  
  16=2^n=2^4
• 13 years agoHelpfull: Yes(1) No(4)
• So, my outcome should contain 2 heads and 2 tails. Total no of ways in which 2 heads and 2 tails can be arranged is=no of arrangements of 4 things taken all at a time where 2 are alike of one kind and 2 are alike of the other kind= 4!/(2!*2!)
  =6 .Now total no of possible outcomes=2^4=16 Therefore required probability= 6/16
  =3/8
• 12 years agoHelpfull: Yes(0) No(0)
• the total no of outcomes is 2^4=16.out of this only 4 has exactly 3 heads .so 4/16=1/4
• 7 years agoHelpfull: Yes(0) No(0)