Question Number 11425 by tawa last updated on 25/Mar/17
![](https://www.tinkutara.com/question/947.png)
Answered by mrW1 last updated on 25/Mar/17
![(1) 12C5=792 (2) 9C5+3×(9C4)+3×(9C3)=126+3×126+3×84=756 (3) 10C5+10C3=252+120=372](https://www.tinkutara.com/question/Q11426.png)
$$\left(\mathrm{1}\right)\:\mathrm{12}{C}\mathrm{5}=\mathrm{792} \\ $$$$\left(\mathrm{2}\right)\:\mathrm{9}{C}\mathrm{5}+\mathrm{3}×\left(\mathrm{9}{C}\mathrm{4}\right)+\mathrm{3}×\left(\mathrm{9}{C}\mathrm{3}\right)=\mathrm{126}+\mathrm{3}×\mathrm{126}+\mathrm{3}×\mathrm{84}=\mathrm{756} \\ $$$$\left(\mathrm{3}\right)\:\mathrm{10}{C}\mathrm{5}+\mathrm{10}{C}\mathrm{3}=\mathrm{252}+\mathrm{120}=\mathrm{372} \\ $$
Commented by tawa last updated on 25/Mar/17
![God bless you sir](https://www.tinkutara.com/question/Q11427.png)
$$\mathrm{God}\:\mathrm{bless}\:\mathrm{you}\:\mathrm{sir} \\ $$