How many signals can be given with 6 flags of different colours such that:
(a) 3 flags are used for a signal. (120) (c) At least 3 flags are used for a signal.(1920)
(b) At most 3 flags are used for a signal.(156) (d) Any numbers of flags are used for a signal.
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(b) at most 3 flags are used for a signal
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Answer:
correct answer is (B) 1956
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