Question

A coin is tossed three times. (a) what is the probability that the coin will land tails at least twice

Answer 1

Sample Space =  {HHH, HHT, HTH, HTT, TTT, THH, TTH, THT}
So required probability = 4/8  = 1/2

Answer 2

$\frac{1}{2} \times \frac{1}{2} = 0.25$
that's the probability