F.6 math arithmetic sequence~
2011-09-21 2:29 am
The number of toothpicks in the 1st, 2nd, 3rd and 4th figures are 4, 12, 24 and 40 respectively. Find the number of toothpicks in the n th figure.
回答 (1)
2011-09-21 2:35 am
✔ 最佳答案
= 4 * ((1 + n) * n) / 2By the way I do not think this is an arithematic sequence.
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