Number of natural numbers between 100 & 1000 such that at least one of their digits is 6, is

Nmber of natural numbers between 100 and 1000 such that at least one of the digits is 7, is

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

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

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

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

Find the sum of all natural numbers between 100 and 1000 which are multiples of 6.

The middle digit of a number between 100 and 1000 is zero and the sum of the other digit is 13. If the digits are reversed , the number so formed exceed the original number by 495. Find the number.