Aptitude - Probability - Discussion

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Q.

There are 6 boxes numbered 1,2,...6. Each box is to be filled up either with a red or a green ball in such a way that at least 1 box contains a green ball and the boxes containing green balls are consecutively numbered. The total number of ways in which this can be done is:                         


A. 5 B. 21
C. 33 D. 60

Answer: Option B
Explaination:

 





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