Mathematics, 12.10.2020 20:01, bravoy
Ten digit telephone number has a form (XYZ) - ABC-DEFG. In the particular state there are 4 possible area codes (404, 470, 678, and 770). The digit A is restricted to a number 2 through 7. The digits B, C, and D can be any number but they cannot repeat. E, F, G have no restrictions. How many phone numbers are possible with these restrictions?
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Ten digit telephone number has a form (XYZ) - ABC-DEFG. In the particular state there are 4 possible...
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