Mathematics, 09.10.2019 00:10, santosbeti90

Aston university creates a 10 digit student number as the university enrolls each student. the first two characters must be a digit 1 through 9. the next seven characters can be anything and the last digit just can’t be the same as the ninth character (i. e. the previous digit). how many student numbers are possible?

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Aston university creates a 10 digit student number as the university enrolls each student. the first...