what is the awenswer to this math problem 7C 4

Hello Melody, please look my last answer.

http://welt-zeit-uhr.de/zahlensysteme/

I hope you have understood ?!

Gruß radix !

what is the awenswer to this math problem 7C 3

nCr(7,4)

$${\left({\frac{{\mathtt{7}}{!}}{{\mathtt{4}}{!}{\mathtt{\,\times\,}}({\mathtt{7}}{\mathtt{\,-\,}}{\mathtt{4}}){!}}}\right)} = {\mathtt{35}}$$

what is the awenswer to this math problem 7C 4

what is the awenswer to this math problem 7C 3

$$\small{\text{$7C4 = 7C3 = \dbinom74 = \dbinom73= 35 $}}$$

7C4        16 - system     =>    1988  decimal 

7C4        13 - system     =>    1343  decimal

7C4        15 - system     =>    1759  decimal

    7               C          4           in 16 -system

7*16²  +  12*16  + 4   =    1988       in the decimal system

$${\mathtt{7}}{\mathtt{\,\times\,}}{{\mathtt{16}}}^{{\mathtt{2}}}{\mathtt{\,\small\textbf+\,}}{\mathtt{12}}{\mathtt{\,\times\,}}{{\mathtt{16}}}^{{\mathtt{1}}}{\mathtt{\,\small\textbf+\,}}{\mathtt{4}}{\mathtt{\,\times\,}}{{\mathtt{16}}}^{{\mathtt{0}}} = {\mathtt{1\,988}}$$

Gruß radix !

I don't understand your answer Radix   

Yes I understand.

Thanks Radix :)