Q14 REPRESENTATIONS
Suppose n is an integer such that the sum of digits on n is 2, and 10^10<n <10^11. The number of different values of n is
a. 11
b. 10
c. 9
D. 8
The answer is B.
10,000,000,000
< n < 100,000,000,000
—> 10,000,000,001
—> 10,000,000,010
—> 10,000,000,100
—> 10,000,001,000
—> 10,000,010,000
—> 10,000,100,000
—> 10,001,000,000
—> 10,010,000,000
—> 10,100,000,000
—> 11,000,000,000
Also, we got 20,000,000,000
In total, there are 11 values of n between 10^10 and 10^11Write Here