Three unbiased coins are tossed together. Find the probability of getting

CBSE Class 9
1

Three unbiased coins are tossed together. Find the probability of getting

  1. Two heads.
  2. At least two heads.
  3. No heads
2

When 3 unbiased coins are tossed, the sample space is {HHH, HTH, HHT, THH, THT, TTH, HTT, TTT] = 8

Event of getting two heads = {HTH, HHT, THH} = 3
P(Two Heads) = 3/8

Event of getting At least two heads (two or more than 2 heads) = {HHH, HTH, HHT, THH} = 4

P(At least Two Heads) = 4/8 = 1/2

Event of getting No heads = {TTT} = 1

P(No Heads) = 1/8