Question

Johnny flips a coin three times. what is the probability he lands on heads every time

Answer 1

there is a 1/2 probability of landing on heads each flip

he flips it 3 times

so 1/2 x 1/2 x 1/2 = 1/8 probability of getting heads every time.

Answer 2

$|\Omega|=2^3=8\\ |A|=1\\\\ P(A)=\dfrac{1}{8}=12.5\%$