下列代码依次输入10,3,2后，运行结果是什么？
def sum(n):
first_term = int(input())
common_diff = int(input())
last_term = first_term + (common_diff * (n - 1))
sum = ((first_term + last_term) / 2) * n
return sum
num_terms = int(input())
result = sum(num_terms)
print(result)
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