Question -
Answer -
Given urn contains 5red and 5 black balls.
Let in first attemptthe ball drawn is of red colour.
⇒ P (probabilityof drawing a red ball) = 5/10 = ½
Now the two balls ofsame colour (red) are added to the urn then the urn contains 7 red and 5 blackballs.
⇒ P (probabilityof drawing a red ball) = 7/12
Now let in firstattempt the ball drawn is of black colour.
⇒ P (probabilityof drawing a black ball) = 5/10 = ½
Now the two balls ofsame colour (black) are added to the urn then the urn contains 5 red and 7black balls.
⇒ P (probabilityof drawing a red ball) = 5/12
Therefore, theprobability of drawing the second ball as of red colour is:
