Question 1078846
H = event of landing on heads
T = event of landing on tails


Saying something like TTT means landing on three tails in a row. Saying P(TTT) is notation to mean "the probability of landing three tails" and P(T) is the probability of landing on tails for any given coin taken individually. Because each toss doesn't affect one another, we know that P(T and T and T) = P(T)*P(T)*P(T) allowing us to say


P(TTT) = P(T and T and T)
P(TTT) = P(T)*P(T)*P(T)
P(TTT) = (1/2)*(1/2)*(1/2)
P(TTT) = 1/8
P(TTT) = 0.125


The probability as a fraction is 1/8
The probability as a decimal is 0.125
The probability as a percentage is 12.5%


The answer format will depend on what your teacher wants.