Question
Use what you have found above to describe a quick way of adding up the first 20 add number answer in short and in number
Answers
GPT 3.5
To quickly add up the first 20 odd numbers, you can use the formula for the sum of an arithmetic series: S = n/2 * (2a + (n-1)d), where S is the sum, n is the number of terms, a is the first term, and d is the common difference. In this case, n = 20, a = 1, and d = 2 (since we are adding odd numbers). Plugging in these values, we get: S = 20/2 * (2*1 + (20-1)*2) = 10 * (2 + 38) = 10 * 40 = 400. Therefore, the sum of the first 20 odd numbers is 400.