Question

пожалуста помогите я даю 50 балов​

Answer 1

1. 10!/(4!*(10-4)!)=10*9*8*7/24==9*8*7/12=42*5=210

2 cпособ. найдем 10!=10*9*8*7*6*5*4*3*2*1=3628800; 4!=24; 6!=720

3628800/(24*720)=3628800/17280=210

2. 8!/(3!*5!)=8*7*6/(2*3)=8*7=56

2 способ. 8!=8*7*6*5*4*3*2*1=40320; 3!=6; 5!=120;

40320/(120*3)=40320/360=56

3. 7!/(5!*2!)=7*6/2=21

2 способ 7!=1*2*3*4*5*6*7=5040; 5!-120; 2!=2;

5040/(2*120)=5040/240=21

4. 5!/(3!*2!)=5*4/2=10

2 способ.  5!=120; 3!=6; 2!=2;

120/(6*2)=10