Applied Test Series

Question

A large bowl contains 15 balls that are identical except for their colors 6 are colored red, 5 are colored blue and 4 are colored green. What is the probability that two balls selected at random from the bowl have the same color_____

Comments

31/105

Answer 1

Answer is $\frac{31}{105}$

 

Answer 2

(6C2 + 5C2 + 4C2)/15C2

=31/105

i. e,  choose 2balls of red color or

        choose 2 balls of blue color or

        choose 2balls of green color

out of total 15balls