A bag contains 6 white and 4 black balls .2 balls are drawn at random. Find the probability that they are of same colour.	Choose the correct choice:
A) 1/2
B) 7/15
C) 8/15
D) 1/9
E) 2/9
Let S be the sample space   Then n(S) = no of ways of drawing 2 balls out of   (6+4)= 
<gadget id="calculator">  (6+4)</gadget>
<output>10</output>
10C2= 10x9/2x1 =45   Let E = event of getting both balls of same colour   Then,n(E) = no of ways (2 balls out of six) or (2 balls out of 4)   =6C2 + 4C2 = 6x5/2x1 + 4x3/2x1 15+6 =21   Therefore, P(E) = n(E)/n(S) = 21/45 = 7/15   Answer is 7/15
<result>B</result>
A bag contains 6 white and 4 black balls .2 balls are drawn at random. Find the probability that they are of same colour.