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A meeting is to be addressed by 5 speakers A, B, C, D, E. In h

Question

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

120

B

24

C

60

D

5^{4} \times 4

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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)?

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Text solutionVerified

Meeting is to be addressed by

5

speakers

a, b, c, d, e

5

speaker can be address in

5!

ways

= 120

Either

b

can speak before a or after a

ways the speaker be ordered is

b

must not precede

a = \frac{120}{2} = 60

∴

Answer is

60

ways

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Question Text	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)?
Answer Type	Text solution:1
Upvotes	150