Answer: I tried....
To find the sum of all two-digit positive numbers, you can use a mathematical formula for the sum of an arithmetic series. In this case, you want to find the sum of all two-digit numbers from 10 to 99.
The formula for the sum of an arithmetic series is:
Sum = (n/2) * [2a + (n-1)d]
Where:
n is the number of terms.
a is the first term.
d is the common difference between terms.
For this case:
n = There are 90 two-digit numbers (from 10 to 99), so n = 90.
a = 10 (the first two-digit number).
d = 1 (since the difference between each consecutive two-digit number is 1).
Now, plug these values into the formula:
Sum = (90/2) * [2 * 10 + (90-1) * 1]
Sum = (45) * [20 + 89]
Sum = 45 * 109
Sum = 4,905
So, the sum of all two-digit positive numbers from 10 to 99 is 4,905.