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

• if a coin tossed 3 times means the outcomes are n(s)=2^3 =8
  H H H
  H H T
  H T H
  T H H
  T T T
  T T H
  T H T
  H T T
  so
  if the first toss produces a head means i.e from either of {TTH,HTT,THT}
  Then the favarable things to getng exactly two heads{THH,HHT,HHH,HTH}=4
  SO the ans is P(E)=n(e)/n(s)=4/8=1/2
• 13 years agoHelpfull: Yes(0) No(4)