How many four-digit numbers can be formed under the following condition?

The leading digit cannot be zero and the number must be less than 7,000.
a. 5,800
b. 6,000
c. 5,700
d. 5,900


b. 6,000
There are 6,000 possible four-digit numbers that can be formed if the leading digit cannot be zero and the number must be less than 7,000.

Mathematics

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