Draw a circle around the ratio that is NOT EQUIVALENT to 6 to 10

1. 9 : 15

2. 3 : 15

3. 18 : 30

4. 5 : 3

i have been struggling all day, please help a sad girl out:)

5:3

Step-by-step explanation:

is equivalent to 5

3

because 5 x 2 = 10 and 3 x 2 = 6

6

Step-by-step explanation:

This is a case of combination since the order does not matter, it only matters that there must be a marble in each one inside, therefore we must apply its formula.

xCn = n! / x! * (n - x)!

n, in this case it would be 4 because we must subtract 2 from the total 6, since there must already be one inside in each display case.

x = 2, since it is the number of showcases.

Replacing:

 2C4 = 4! / 2! * (4 - 2)! = 6

Which means that you can in six different ways.