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

How many numbers between 100 and 1000 have the digit 7 exactly once?

How many numbers between 100 and 1000 such that the digits in the unit place of the numbers is 9 only?