题解 | 等差数列
等差数列
https://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
import sys
n = int(input())
sum = 0
for i in range(n):
sum1 = 2+3*i
sum += sum1
print(sum)
等差数列
https://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
import sys
n = int(input())
sum = 0
for i in range(n):
sum1 = 2+3*i
sum += sum1
print(sum)
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