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According to the law of n (n + 1), the value of 100 + 102 + 104 + 106 +.. + 998 + 1000 is calculated,
100+102+104+106+..+998+1000
＝2×﹙50＋51＋52＋53＋…… ＋499＋500﹚
＝2×﹙50＋500﹚×451÷2
＝550×451
＝248050.
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