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April 19, 2014

Homework Help: Math. Explain

Posted by Sebastian on Monday, March 26, 2012 at 3:49pm.

From the digits 1, 2, 3, and 4, how many positive integers are less than 100,000? Consider the possibilities for 5-digit, 4-digit, 3-digit, 2-digit, and 1-digit numbers and repetition of digits.

1,364
1,024
256

A telephone dial has holes numbered from 0 to 9 inclusive, and eight of these holes are also lettered. How many different telephone numbers are possible with this dial, if each "number" consists of two letters followed by five numbers, where the first number is not zero?

200,000
5,760,000
6,400,000

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