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The number of different signals which can be given form 6 flags of different colours taken one or more at a time is

The number of different signals which can be given form 6 flags of different colours taken one or more at a time is Correct Answer 1956

6c1×1! + 6c2×2! + 6c3×3! + 6c4×4! + 6c5×5! + 6c6×6! = 1956 যেহেতু one or more at a time বলছে তাই নিজেদের মধ্যে ও factorial দিয়ে গুণ হয়েছে।

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