A.  16

B.  32

C.  64

D.  128

1
Correct Answer :
64
Explanation :

The required number of ways can be formed as (1 black and 2 non-black) or (2 black and 1 non-black) or (3 black)

=> Required number of ways = (3C1 x 6C2) + (3C2 x 6C1) + (3C3)

                                            = (45 + 18 + 1)

                                            = 64


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