## anonymous one year ago In the year 2535, astronauts Milky and Way are blasting around the solar system. If they could decide to visit 5 of the 9 planet, how many different selections could they make?

1. IrishBoy123

do you know ""n choose k"": eg $$\\^nC_k$$ or $$\left(\begin{matrix}n \\ k\end{matrix}\right)$$? if you don't, you can draw a diagram and figure it out.

2. anonymous

what

3. anonymous

eg nCk or (nk)

4. anonymous

idk what that is