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But, it would be 200 ? 17 where ? replaces the operator that should have been in the question.
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you replace the "n" with ahundred e.g... if it's 2n+1, you will go 2x100+ 1 which is 201
a(n) = -1 - 2n; In your case n = 17 so a(17) = -35
You need an equation for the nth term of the sequence, or some other means of identifying the sequence. In general, they will be a+n, a+2n, a+3n and a+4n although some go for a, a+n, a+2n and a+3n.
The Nth term in the series is [ 2N ] .
2n+4/2 term 1 = 3 term 2 = 4 term 3 = 5 term 4 = 6