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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 |
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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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