- #1

- 41

- 0

## Homework Statement

So I want to prove that the expression 20Cr×0.1

^{r}0.9

^{(20-r)}reaches maximum value for r=(0.1)×20=2

## Homework Equations

## The Attempt at a Solution

I can prove it by trial and error but can't differentiate the expression because nCr isn't continuous.