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Using digits 1, 2, 3, 4; find number of 10-digit sequences such that the difference between two consecutive digits is 1?

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Using the digits 1, 2, 3 and 4, find the number of 10-digit sequences that can be written so that the difference between any two consecutive digits is 1.

Examples of such 10-digit sequences are ********** and **********.

posted Apr 7, 2018 by anonymous

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