20*(20+1)/2 = 210
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The sum of the first 20 integers is 190.
There are 20.
Two of them. Two of them. Two of them. Two of them.
The integers 2 and 10 have a product of 20 and a sum of 12.
To find the sum of the series of the first 20 positive integers ending in 3, we first need to identify the pattern. The series would be 3, 13, 23, 33, ..., 193. This is an arithmetic series with a common difference of 10. To find the sum, we can use the formula for the sum of an arithmetic series: n/2 * (first term + last term), where n is the number of terms. Plugging in the values, we get 20/2 * (3 + 193) = 10 * 196 = 1960. Therefore, the sum of the series is 1960.