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

How many 3 -digit numbers can be formed by using the digits 1 to 9 if no digit is repeated?

How many 3 -digit numbers can be formed by using the digits 1 to 9 if no digit is repeated?

How any three digit odd numbers can be formed by using the digits 1,2,3,4,5,6 if,The repetition of digits is not allowed? The repetition of digits is allowed?

How many 3-digit numbers can be formed by using the digits 1 to 9 if no digit is repeated?

How many numbers can be formed fro the digits 1,2,3 and 9, if repetition of digits is not allowed?

How many 5-digit prime numbers can be formed using the digits 1, 2, 3, 4, 5 if the repetition of digits is not allowed?

How many non-zero numbers can be formed using the digits 0,1,2,3,4 and 5 if repetition of digits is not allowed?

How many numbers can be formed from digits 1, 3, 5, 9 if repetition of digits is not allowed?