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A meeting is to be addressed by 5 speakers A, B, C, D, E. In how many ways can the speakers be ordered, if B must not precede A (immediately or otherwise)?A. 120B. 24C. 60D. `5^(4) xx 4` |
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Answer» Correct Answer - B According to given restriction. B must not preced A (immediately or otherwise) `rArr` A must follow B, i.e., B should addressed the meeting at first place. So, rest of the four speakers can address in 4! Ways. `:.` Required number of ways `= 4! = 24` |
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