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The answer depends on what information you have.

If you know the first number, a, and the common difference d, (where d is negative), then the nth term is

a + (n - 1)*d : exactly the same as in an increasing linear sequence. The only difference is that d is negative instead of positive.

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Q: How do you find the nth term of decreasing linear sequence?
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Related questions

How do I find the nth term of a decreasing linear sequence?

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