Question

How many combinations are possible with repeats for C(5, 2)

Answer 1

@SolomonZelman Could you please help me?

Answer 2

\(\LARGE\color{midnightblue}{ \rm n~C~r~=~\frac{n!}{r!(n-r)!} }\)

Answer 3

\(\LARGE\color{purple}{ \rm 5~C~2~=~\frac{5!}{2!(5-2)!} }\)

Answer 4

Finish the calculations from here.

Answer 5

What does the "!" symbol mean?

Answer 6

\(\large\color{blue}{ \rm 8!=1 \times 2 \times 3 \times 4 \times 5 \times 6 \times 7 \times 8 }\)
\(\large\color{green}{ \rm 7!=1 \times 2 \times 3 \times 4 \times 5 \times 6 \times 7 }\)
\(\large\color{red}{ \rm 6!=1 \times 2 \times 3 \times 4 \times 5 \times 6 }\)
\(\large\color{blue}{ \rm 5!=1 \times 2 \times 3 \times 4 \times 5 }\)

\(\large\color{darkorange }{ \rm ~~BUT,~~~ 0!=1~~~(exception) }\)

Answer 7

See the idea behind the ` ! ` ?

Answer 8

Its mean "factorial", For example 5! = 5*4*3*2*1

Answer 9

Thank you!