Please help me understand what I am doing wrong. I am using the equally likely outcomes formula

Probability of event = Number of outcomes favorable to event / total number of outcomes

Consider a family with 4 children. Assume the probability that one child is a boy is 0.5 and the probability that one child is a girl is also 0.5, and that the events "boy" and "girl" are independent. (a) List the equally likely events for the gender of the 4 children, from oldest to youngest. (Let M represent a boy (male) and F represent a girl (female). Select all that apply.) FMFF OFMMF FMFM MMFM MMMM FFMF MFFM MMMF OMFMM MMFF O MFFF FMMM MFMF FFMM O FFFM FFFF X (b) What is the probability that all 4 children are male? (Enter your answer as a fraction.) 1/16 Notice that the complement of the event "all four children are male" is "at least one of the children is female." Use this information to compute the probability that at least one child is female. (Enter your answer as a fraction.) 15/16