How many 4 digits numbers can be formed by using the digits to 9 if repetition of digits is not allowed?

How many 4 -digit numbers can be formed by using the digits 1 to 9 if repetition of digits is not allowed?

How many 4-digit numbers can be formed by using the digits 1 to 9 if repetition of digits is not allowed?

How many 4-digit numbers can be formed by using the digits 1 to 9 if repetition of digits is not allowed?

How many 4-digit numbers can be formed by using the digits 1 to 9 if repetition of digits is not allowed?

How many 4-digit numbers can be formed by using the digits 1 to 9 if repetition of digits is not allowed?

How many 4-digit numbers can be formed by using the digits 1 to 9 if repetition of digits is not allowed?

How many 4-digit numbers can be formed by using the digits 1 to 9 if repetition of digits is not allowed?

How many 4 -digit numbers can be formed by using' the digits 1 to 9 'if repetitions of digits is not allowed?

How many four digit numbers can be formed using the digits 4,5,6,7,8 if repetition of digits is not allowed?

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