Answer:
Step-by-step explanation:
At least 2 heads means it cold have 2 heads or 3 heads
Count how many posibilities to have 2H or 3H are there
HHH, HHT, HTH, THH they are 4 posibilities
the probability to have at list 2 heads is
P = #of 2H and 3H / #of all outcomes = 4/ 8 = 1/2
