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关于数学的翻译,在线等~急!

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关于数学的翻译,在线等~急!
The first four terms of a sequence are shown above.
Which of the following could be the formula that gives the nth term of this sequence for all positive
integers n?
Miguel is 180 centimeters tall. At 2:00 p.m. one day, his shadow is 60 centimeters long, and the shadow of a nearby fence post is t centimeters long. In terms of t, what is the height, in centimeters, of the fence post?
关于数学的翻译,在线等~急!
一列数的前四项已经在上面展示了.
下面哪个式子可能是那个可以给出这个数列的第n项(n是正整数)的方程式.