Five different digits from the set of numbers {1,2,3,4,5,6,7} are written in random order. How many numbers can be formed using 5 different digits from this set if the number is divisible by 9 ?

Five different digits from the setoff numbers {1,2,3,4,5,6,7} are written in random order. How many numbers can be formed using 5 different digits from set {1,2,3,4,5,6,7} if the number is divisible by 9?

Five different digits from the set of numbers {1, 2, 3, 4, 5, 6, 7} are written in random order. Find the probability that five-digit number thus formed is divisible by 9.

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

How many two-digit numbers are divisible by 3?

How many three-digit numbers are divisible by 7?

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 from the digits 1, 2, 3, 4 when repetition 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 numbers can be formed using the digits 1,2,3,4,2,1 such that even digits occupies even place?