How many 3-digit number have exactly one of their digits as 5?

(i) How many numbers are there between 100 and 1000 such that at least one of their digits is 7 ? (ii) How many of them have exactly one of their digits as 7 ?

How many 6-digit numbers have at least 1 even digit?

How many numbers are there between 100 and 1000 which have exactly one of their digits as 7?

How many 3 -digit even number can be formed form the digits 1,2,3,4,5,6 if the digits can be repeated?

How many 3-digit even numbers can be formed from the digits 1,2,3,4,5,6 if the digits can be repeated?

How many 3 -digit even numbers can be formed from the digits 1,2,3,4,5,6 if the digits can be repeated?

How many 5 -digit numbers are there in all?

How many six-digit numbers contain exactly four different digits?

How many 3 digit numbers can be formed by using the digits 0, 1, 2, 3, 4, 5 in how many of these we have atleast one digit repeated ?

How many numbers are there between 100 and 1000, which have exactly one of their digits as 7?