A couple decided to have 4 children. What is the probability that they will have at least one boy? Solution To have 4 children the total number of possible outcomes is 2^4=16(FFFF,FFFM,FFMF,FFMM,FMFF,FMFM,FMMF,FMMM,MFFF,MFFM,MFMF,MFM M,MMFF, MMFM,MMMF,MMMM) .The probability of having at least one boy is 15/16.