Question: Answer all parts of Exercise with "circle" instead of "row." (In every circle, people sit facing inward.)
Exercise: (a) In how many ways can ten boys and four girls sit in a row?
(b) In how many ways can they sit in a row if the boys are to sit together and the girls are to sit together?
(c) In how many ways can they sit in a row if the girls are to sit together?
(d) In how many ways can they sit in a row if just the girls are to sit together?