Task: Question Answering
Input (English): Problem: 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 
Options: a ) 22 , b ) 21 , c ) 45 , d ) 27 , e ) 25
Output (English): b