Limit/range based questions in permutation How many numbers greater than 999 but less than equal to 4000 is formed using the digits 0, 1,2, 3, 4 when (a) Repetition of digits allowed (b) Repetition of digits not allowed

How many numbers greater than equal to  200 but less than equal to  4000 is formed using the digits 0, 1,2, 3, 4 when
(a) Repetition of digits allowed
(b) Repetition of digits not allowed

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How many numbers greater than   999 but less than equal to  4000 is formed using the digits 0, 1,2, 3, 4 when
(a) Repetition of digits allowed
(b) Repetition of digits not allowed