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horrorfan [7]
2 years ago
15

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

Mathematics
1 answer:
lyudmila [28]2 years ago
6 0

Answer:

there are 8 million different phone numbers whose phone numbers whose digits aren't 0 or 1

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\left \{ {{x+3y=9~(3)} \atop {3x-y=7(-1)}} \right. \\
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