23. The nine digits 1, 2, 3, ..., 9 are arranged in random order to form a nine-digit
number. Find the probability that 1, 2 and 3 appear as neighbours in the order mentioned.
(C.U., B.A. (Econ) '721
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The nine digits 1, 2, 3, ..., 9 are arranged in random order to form a nine-digit
number. Find the probability that 1, 2 and 3 appear as neighbours in the order mentioned.
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