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[" Hint: Required number of threngented ...

[" Hint: Required number of threngented "C_(4)times9!" .I "],[" Inereare "10" lamps in a hall.Each one of them can be switched on independently."],[" Find the number of ways in which the hall can be illuminated."],[" chint.Reauired number "=2^(10)-1]" ."]

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