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How many 7 digits telephone numbers are there that begin with 123 and that contain 3 or 7?
Wiki User
∙ 12y ago
Since the numbers begin with 123, they all contain a 3. As a result, they all "contain 3 or 7".
So the remaining 4 digits can be any digits and this gives 104 = 10,000 such numbers.
Wiki User
∙ 12y ago
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