Question

Three coins are tossed. Find the probability of getting atleast two head.

Answer 1

Sample space is $\left(HHH\right),\left(HHT\right),\left(HTH\right),\left(THH\right),\left(HTT\right),\left(THT\right),\left(TTH\right),\left(TTT\right)$

Favourable outcomes $\left(HHT\right),\left(HTH\right),\left(THH\right),\left(HHH\right)$

Probablity $P=\frac{\text{favourable outcomes}}{\text{total outcomes}}=\frac{4}{8}=\frac{1}{2}$