-11n + 17
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If you mean: 34 39 24 ... then the nth term is 39-5n and so the 100th term = -461
There are 34 even numbers between 1 and 70. The even numbers in this range start from 2 and go up to 70, forming the sequence 2, 4, 6, ..., 70. This sequence can be calculated using the formula for the nth term of an arithmetic sequence, where the first term is 2, the common difference is 2, and the last term is 70. Since the sequence contains 34 terms, there are 34 even numbers in total.
-n2+2n+49
tn = 34 - 9n where n = 1,2,3,...
17/3