A 4-digit number is formed by using four of the seven digits 1, 3, 4, 5, 7,

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A 4-digit number is formed by using four of the seven digits 1, 3, 4, 5, 7, 8 and 9.

No digit can be used more than once in any number.

Find how many different 4-digit numbers can be formed if

a. There are no restrictions,

b. The number is less than 4000,

c. The number is even and less than 4000.

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