A rectangular floor measures 2 by 3 meters. There are 5 white, 5 black and 5 red parquet block available. If each block measure 1 by 1 m, in how many different color patterns can the floor be parqueted?
a) 104
b) 577
c) 213
d) 705
e) 726
rectangular floor
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floor=2*3 meters and thus it means 6 tiles can be placed
for 1st tile, we have 3 options
for 2nd, we have 3 options
3rd-3
4th-3
5th-3
6th-3
Total=3*3*3*3*3*3 = 729
cases when for all of 6 we choose the same color = 3 (all white, all black and all red)
Thus subtract these (as we only have 5 tiles of each color)
729-3 = 726
IMO E
for 1st tile, we have 3 options
for 2nd, we have 3 options
3rd-3
4th-3
5th-3
6th-3
Total=3*3*3*3*3*3 = 729
cases when for all of 6 we choose the same color = 3 (all white, all black and all red)
Thus subtract these (as we only have 5 tiles of each color)
729-3 = 726
IMO E
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