Question

A bag contains 7 black and 4 red balls. If 3
balls are drawn at random find the probability
that (i) all are black (ii) one is black and two are red.

NOTE: PLEASE ANSWER WITH EXPLANATION.​

Answer 1

total are 11

black = 3/11

red or black= 3/11

Answer 2

total = 11

black = 3/11

one black and two red =3/11

Explanation :-

black balls quantity is given=3 and total balls are=11, so =3/11

one black and two red=1+2=3 and total balls are =11,so 3/11