How many odd numbers are there with three digits such that if 4 is one of the digits, then 6 is the next digit?

How many even numbers are there with three digits such that if 5 is one of the digits, then 7 is the next digit ?

How many 4-digit numbers are there with no digit repeated?

How many 3-digit numbers are there without repetition?

How many numbers are there between 100 and 1000 such that at least one of their digits is 7 ?

How many three-digit numbers are there, with distinct digits, with each digit odd ?

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

How many numbers are there between 1000 and 9999 so that no digit is repeated.

How many numbers of two digits are divisible by 6 ?