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

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

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

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

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

How many three-digit numbers can be formed from the digits 0, 1, 3, 5, 6 if repetitions of digits (i) are allowed (ii) are 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?