Six boxes are numbered 1,2,3,4,5 and 6. Each box must contain either a white ball or a black ball. At least one box must contain a black ball and boxes containing black balls must be consecutively numbered. find the total number of ways of placing the balls.

Six boxes are numbered 1,2,3,4,5 and 6. Each box must contain either a

1.	Six boxes are numbered 1,2,3,4,5 and 6. Each box must contain either a white ball or a black ball. At least one box must contain a black ball and boxes containing black balls must be consecutively numbered. find the total number of ways of placing the balls.
A.	15
B.	20
C.	21
D.	36
Answer» D. 36

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Six boxes are numbered 1,2,3,4,5 and 6. Each box must contain either a white ball or a black ball. At least one box must contain a black ball and boxes containing black balls must be consecutively numbered. find the total number of ways of placing the balls.

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