The number of ways, 16 identical cubes, of which 11 are blue and rest are red, can be placed in a row so that between any two red cubes there should be at least 2 blue cubes, is…………
The number of ways, 16 identical cubes, of which 11 are blue and rest are red, can be placed in a row so that between any two red cubes there should be at least 2 blue cubes, is…………
Asked by Shiksha User
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1 Answer
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First we arrange 5 red cubes in a row and assume
and
so
No. of solutions = 8C5 = 56
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