Find the general term of the following sequence.
1,3,6,10,15,21...
要詳細D!!!
有冇人可以解答我呢條數學題?要交功課AR!!!
2010-10-11 4:25 am
回答 (1)
2010-10-11 4:31 am
✔ 最佳答案
T(1) = 1T(2) = 1 + 2 = 3T(3) = 1 + 2 + 3 = 6T(4) = 1 + 2 + 3 + 4 = 10T(5) = 1 + 2 + 3 + 4 + 5 = 15T(6) = 1 + 2 + 3 + 4 + 5 + 6 = 21....................................................T(n)= 1 + 2 + 3 + ... + n= n(n+1)/2
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