A very interesting GMAT counting methods question. Does not require any formula or special knowledge to solve this question.
Question
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. 63
D. 60
E. 6
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