Question

How many 7- digit number are there? a) 8999999

b)9000000

c) 1000000

d)none of these

Answer 1

The general form of the equation for questions like this would be something lIke the following:

(largest number in the set - smallest Number I the set) + 1.

So,

(9,999,999 - 1,000,000) + 1

thus,

8,999,999 + 1 = 9,000,000