edited by
325 views
0 votes
0 votes

There are $6$ boxes numbered $1, 2, \dots,6.$ Each box is to be filled up with a red or green ball in such a way that at least one 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

  1. $5$
  2. $21$
  3. $33$
  4. $60$
edited by

Please log in or register to answer this question.

Related questions

0 votes
0 votes
0 answers
1
go_editor asked Feb 8, 2016
350 views
How many three digit positive integers, with digits $x, y$ and $z$ in the hundred's, ten's and unit's place respectively, exist such that $x < y, z < y$ and $x \neq 0?$$2...