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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Anuj s. Best Answer
here is your solution any doubt, plz ask, we will discuss
can't we find probability in any other way
it is basic and easy way, you can find by fix the black ball at last position and then check the no. of ways of arrangement
check the probability at only 1 possible way of arrangement
then multiplying the probability (of 1arrangement) by total no. of arrangements