The number of all 8 digit odd numbers is

Step-by-step solution

For this, we must ensure that the last digit (8th digit) is odd, which means it can only be 1,3,7,5 or 9 and first digit can't be zero. The total no. of 8-digit odd numbers. =( Choices for first digit ) ( Choices for the remaining 6 digits) Choices for the last digit. =9 10^6 5=45 10^6