Question

How many different positive integers exist between 10 6 and 10 7. If the sum of whose digits is 2

Answer 1

Answer:

So, the numbers should be from 1,000,000 to 10,000,000

The following two cases are possible for the sum of the digits to be 2:

1. Two 1's and the rest are 0's:

1,000,001

1,000,010

1,000,100

1,001,000

1,010,000

1,100,000

6 numbers.

2. One 2 and the rest are 0's:

2,000,000

1 number.

Total = 7 numbers.