How many ways are there to seat six boys and seven girls in a row of chairs so that none of the girls sit together?
13P13 - (7P2x11P11 + 7P3x10P10 + 7P4x9P9 + 7P5x8P8 +7P6x7P7 + 7P7x6P6)
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Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking. – Community Apr 24 '22 at 15:45
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1Can you explain "at least" in the heading in what context,, and what the expression in the body is supposed to count ? – true blue anil Apr 24 '22 at 16:30