A fair coin is tossed three time in succession. If the first toss produced a head, then the probability of getting exactly two heads in three tosses is...

• First outcome is head.
  Next two can have 2^2 or 4 possible outcomes.
  Of these, I head can be chosen in two ways, => H,T or T,H
  So, probability
  = 2/4
  = 1/2
  Ans. 1/2
  
• 9 years agoHelpfull: Yes(2) No(0)
• 1st is always head H
  so
  HHH,HHT,HTH,HTT
  so ans=2(exatly 2 head)
• 10 years agoHelpfull: Yes(1) No(0)
• NO. OF EVENTS={HHH,HHT,HTH}
  SO ANS IS=3/8
• 9 years agoHelpfull: Yes(1) No(0)