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
Submitted by: Administrator1. 5
2. 21
3. 33
4. 60
Ans : B
Submitted by: Administrator
2. 21
3. 33
4. 60
Ans : B
Submitted by: Administrator
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