B would be the correct answer. If you take 4:13 in order to form a ratio equal to that you have to multiply both sides of the ratio by the same number. 4*4=16 and 13*4=52
So i think you gotta see where the point is ay and if it isnt rig
The probability of drawing exactly one red ball is given by:

the probability of drawing two red balls is given by:

The probability of drawing at least one red ball is:
P(1 red ball) + P(2 red balls) = 16/28 + 6/28 = 11/14.
The answer is
The one that passes through the origin. That one in the lower left part.
This is the equation. Try it for yourself and see if it works.
C= n x 4