1.

What is the number of signals that can be sent by 6 flage of different colour taking one or more at a time ?A. 21B. 63C. 720D. 1956

Answer» Correct Answer - B
Required number of ways
`6_(C_(0)) + 6_(C_(1)) + 6_(C_(2)) + ...+ .^(6)C_(6) -1 = 2^(6) -1 = 64 - 1 = 63`


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