There are 8 digit mobile no's. From that how many 8 digit mobile no.'s can be formed if any digit can be repeated and 0 can also start the mobile number?
Choose the correct choice
A) 9^8
B) 8^2
C) 10^8
D) 9^3
E) 7^5
Here the digits(0,1,2,3,4,5,6,7,8,9) can be repeated and 0 can also be used to start the mobile number. Hence, any of the 10 digits can be placed at each place of the 8 digit number.   10 10 10 10 10 10 10 10   Hence, required number of 8 digit mobile numbers   =10^8   10^8
<result>C</result>
There are 8 digit mobile no's. From that how many 8 digit mobile no.'s can be formed if any digit can be repeated and 0 can also start the mobile number?