1. Кол-во вариантов=1*2*3*4*5*6=720
2.
3.=8!/(2!*6!)=7*8/2=56/2=28
4.6!/6=5!=1*2*3*4*5=120
16!/(8!*2!*6!)=
=(9*10*11*12*13*14*15*16)/(1*2)*(1*2*3*4*5*6)=
=3*11*13*14*15*4=360360
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Answers & Comments
1. Кол-во вариантов=1*2*3*4*5*6=720
2.
3.=8!/(2!*6!)=7*8/2=56/2=28
4.6!/6=5!=1*2*3*4*5=120
16!/(8!*2!*6!)=
=(9*10*11*12*13*14*15*16)/(1*2)*(1*2*3*4*5*6)=
=3*11*13*14*15*4=360360