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 answer.
A) 8/15
B) 5/14
C) 7/15
D) 16/7
E) 4/3
.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=(10*9)/(2*1)= 
<gadget id="calculator">(10*9)/(2*1)</gadget>
<output>45</output>
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)=(6*5)/(2*1)+(4*3)/(2*1)=15+6= 
<gadget id="calculator">15+6</gadget>
<output>21</output>
21   P(E)=n(E)/n(S)=21/45=7/15   Ans: 7/15
<result>C</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.