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

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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.

Options:

A . 15

B . 20

C . 21

D . 36

Answer: Option C

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