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Mathematics

Answered

How many 7-digit telephone numbers can be formed if the first digit cannot be 0 or 1

Answer :

C62712GO C62712GO

Answer:

8,000,000 combinations

Step-by-step explanation:

Since we have 10 digits per slot, we need to remove two digits, 0 and 1, for the first slot therefore we get:

8 × 10 × 10 × 10 × 10 × 10 × 10 =

8,000,000 combinations

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