The rules of sum and product

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candrapetra: Newbie | Next Rank: 10 Posts; Posts: 5; Joined: Sat Aug 20, 2011 4:28 pm

by candrapetra » Sat Aug 20, 2011 4:34 pm

How many possible seven-digit phone number are there if no number begins with 0 or 555 ? if the number either has no 8 or no 9 ? If the number has no 8 and no 9 ?

is there anybody want to help me ?

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Source: Beat The GMAT — Problem Solving | Sat Aug 20, 2011 4:34 pm

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