Question 881841
In how many ways can bricks be laid to fill a wall of length 6 feet using bricks which are 1 foot and 2 feet long.
-----
Ways::
6 1's and 0 2's:: 1 way
4 1's and 1 2 :: 5 ways
2 1's and 2 2's :: 5 ways
0 1's and 3 2's :: 1 way 
============================
Ans:: 12 ways
================
Cheers,
Stan H.
================