11. Number of ways of arranging 4 subjects in 6 periods of a day
a) 1080
b)480
c) 1560
d) 1140
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11. Number of ways of arranging 4 subjects in 6 periods of a day
a) 1080
b)480
c) 1560
d) 1140
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There are 4 subjects and 6 periods . Each subject be allowed in at least one period .
Three periods will have same subject and remaining four periods will have different subjects .
Therefore.,
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