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HOW MANY 7 DIGIT TELEPHONE NUMBERS ARE POSSIBLE IF THE FIRST DIGIT CANNOT BE ZERO...

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HOW MANY 7 DIGIT TELEPHONE NUMBERS ARE POSSIBLE IF THE FIRST DIGIT CANNOT BE ZERO AND:A) THE TELEPHONE NUMBER MUST BE A MULTIPLE OF 100?B) ONLY ODD DIGITS CAN BE USED?C) THE FIRST 3 DIGITS ARE 277?

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