Answer:24 pi square units
Step-by-step explanation:
3/4 is greater than 2/5. 2/5 is .4 and 3/4 is .75
Method OneYour calculator might be able to do this. Mine does it like this.
6
nCr
2
=
15
Method 2You could simply set up 6C2
This gives you
Method ThreeYou only have to do this a couple of times to see how the cancellation works.

After all the cancellation takes place you have
6*5/2 = 15
3:1 , 4*3=12, 5*1=5
Ratio is 3:1