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這個規律不是很難,可以看出,每個數之間的差值是在逐漸加大的,比如0和1相差1,1和3相差2,3和6相差3,6和10相差4等等. 這其實就是一個等差數列的求和問題,首項a1=0,等差為1,所以通項為n(n-1)/2. 希望解答了你的疑問.
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