1.

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. 18
B. 19
C. 20
D. 21
Answer» E.


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