Question

An urn contains 10 red and 6 black balls. A ball is drawn at random, its color is noted and is returned to the urn. Moreover, 3 additional balls of the color drawn are put in the urn and then a ball is drawn at random. What is the probability that first ball drawn is red.

Answer 1

Answer:

10/19

Explanation:

this is because the number of red balls are 10 and the number of blue balls is 6 later 3 was added to the number of balls summing up to 19