Find the probabilities that forgotten digits form sequence

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Problem

Suppose you forgot the last three digits of a telephone number. Find the probabilities that a) forgotten digits form the sequence 7, 4, 0 (in the mentioned order); b) forgotten digits may repeat but all of them from the set {0, 3, 9}; c) only two forgotten digits are the same; d) forgotten digits form a geometric progression with coefficient 2, which members differ from 0.

Reference no: EM131650808

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