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[" neoney? Prove that the number of perm...

[" neoney? Prove that the number of permutations of "n" different objects taken rat a time in which two "],[" muffel bects always occur together is "2!(r-1)^(n-2)P_(r-2)" ."]

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Prove that the no. of permutations of n different objects taken r at a time in which two specified objects always occur together 2!(r-1) (n-2)P_(r-2)

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