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S={1, 3, 5, 7,.............,397, 399}
Set S consists of the odd numbers from 1 to 399, inclusive. How many different ordered pairs (p, t) can be formed, where p and t are numbers in S and p < t? (Note: The sum of the integers from 1 to n, inclusive, is given by the formula $$\frac{n(n+1)}{2}$$ for all positive integers n.)
Set S consists of the odd numbers from 1 to 399, inclusive. How many different ordered pairs (p, t) can be formed, where p and t are numbers in S and p < t? (Note: The sum of the integers from 1 to n, inclusive, is given by the formula $$\frac{n(n+1)}{2}$$ for all positive integers n.)
19900 显示答案
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6.3.4 组合
6.3.4 组合
以上解析由 考满分老师提供。