" Number of natural numbers between "100" and "1000" such that atleast one of their digits is "7" is "

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

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

Number of natural numbers between 100 & 1000 such that at least one of their digits is 6, 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 three digit numbers are there such that atleast one of their digits is 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 7.