An experiment consists of recording the boy-girl composition of families with $2$ children. What is the sample space if we are interested in knowing whether it is a boy or girl in the order of their births?

  • A
    $S = \{ BB, BG, GB, GG \}$
  • B
    $S = \{ BB, BG, GG \}$
  • C
    $S = \{ B, G \}$
  • D
    $S = \{ BB, GG \}$

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