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(4 POINTS) 28) E INVERSE OF A MATRIX TO SOLVE THE FOLLO HOW MANY 7 DIGIT TELEPHONE NUMBERS ARE POSSIBLE IF THE FIRST DIGIT
(4 POINTS) 28) E INVERSE OF A MATRIX TO SOLVE THE FOLLO HOW MANY 7 DIGIT TELEPHONE NUMBERS ARE POSSIBLE IF THE FIRST DIGIT CANNOT BE ZERO AND THE NUMBER MUST BE A MULTIPLE OF 100?
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