How many three digit numbers can be formed without using the digits 0,2,3,4,5 and 6?

How many three digit number can be formed using the digits 1,2,3,4,5 if repetition is not allowed?

How many three-digit even numbers can be formed using the digits 1, 2, 3, 4 and 5 when repetition of digits is not allowed ?

How many three-digit numbers can be formed using the digits 2, 3, 4, 5, 6 if digits can be repeated?

How many three digit numbers can be formed by using the digits, 0,1,2,3 (repetition of digits is allowed)

How many 5-digit numbers can be formed by using the digits 5, 4, 3, 3,0?