4 is correct, since there will be no heads, one head and two tails, two heads and one tail, or three heads. Notice that the order is not involved here.
1 coin has 2 sides. Multiply 2 × 3 to get the total number of outcomes. 2 × 3 = 6 There are 3/6 Possible outcomes. Remember, they are looking for the number of heads, not both.
