Question

Counting question

Answer 1

\(\large \color{black}{\begin{align}
& \normalsize \text{The number of ways of dividing 20 different balloons }\hspace{.33em}\\~\\
& \normalsize \text{in two groups containing 11 and 9 balloons is ? }\hspace{.33em}\\~\\
\end{align}}\)

Answer 2

you choose 11 balloons for the first group
the other group is automatically determined

Answer 3

i agree with ganeshie8

Answer 4

is answer 20C11

Answer 5

Yes, notice, that also equals 20C9 and agrees with our present problem that you could have chosen the balloons for the second group first

Answer 6

answer given is 20C11*9C9

Answer 7

20C11 looks correct to me!

textbook answer could be wrong, doesn't make sense to m

Answer 8

but 9C9=1

Answer 9

lol okay i read it as 20C11*20C9 for some reason