How many 5 - digit telephone numbers can be constructed using the digits 0 to 9 if each number starts with 67 and no digit appears more than once?

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Eti Goyal

Mathematics is not about numbers, equation, computation, or algorithms it is about UNDERISTANDING.

Total 5 digits telephone number is (if no digit appears more than once) = 8*7*6=336
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Rs. 336
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