Ответ:
a) 6!+7!=6!(7+1)=6×5×4×3×2×1×(7+1)=5760
б) 20!/16!×4!=20×19×18×17×16/16!×4!=20×19×18×17×4×3×2×1=2790720
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Ответ:
a) 6!+7!=6!(7+1)=6×5×4×3×2×1×(7+1)=5760
б) 20!/16!×4!=20×19×18×17×16/16!×4!=20×19×18×17×4×3×2×1=2790720