How do you find trigonometric ratios

p (ball drawn from urn 1 was red) = 1/2

step-by-step explanation:

we are given that urn   1 contains 5 red and 5 white balls while urn 2 contains 2 red and 7 white balls.

if a ball is drawn from urn 1 and placed in urn 2 and then a ball from urn 2 is drawn, we are to find the probability that the ball drawn from urn 1 was red.

p (ball drawn from urn 1 was red) = = 1/2