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 from the following answers
A) 8/9
B) 75/4
C) 7/15
D) 3/7
E) 4/3
LET S BE THE SAMPLE SPA7/15E   THEN N(S)=NO OF WAYS OF DRAWING 2 BALLS OUT OF (6+4)=107/152=(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 7/15OLOUR   THEN N(E)=NO OF WAYS(2 BALLS OUT OF SIX) OR(2 BALLS OUT OF 4)   =(67/152+47/152)=(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.