20. An urn contains n white counters numbered 1 through n, n black counters numbered 1 through n, and n red counter numbered 1 through n. If two counters are to be drawn at random without replacement, what is the probability that both counters will be of the same color or bear the same number?

Step-by-step explanation:

choosing randomly a counter of any color; n -1 counters will be left of the same color, total = 3n - 1 counters left

we are told that ; n white counters numbered 1 through n, n black counters numbered 1 through n, and n red counter numbered 1 through n

the transverse axis of a hyperbola is the line that contains the two vertices and the two focuses.

in this example (hyperbola of equation x^2/2 - y^2/4 = 1), the transverse axis is the  x-axis  . 

step-by-step explanation:

21/58.

hope to be marked brainliest