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You need to determine the equation for the general term. That will depend on whether the sequence is additive, multiplicative, or something else. The generating equation will depend on the term's position and putting that equal to 20 will provide the answer.

Additive: 3, 5, 7 ,9 etc (each number is 2 more than the previous one).

Multiplicative: 2, 6, 18, 54, etc (each number is three times the previous one).

Fibonacci: 1, 1, 2, 3, 5, 8 etc (each term, after the first two, is the sum of the previous two).

There can be sequence generated by quadratic, cubic or any other functions so there is no simple way of answering this question.

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Q: How do you find the 20th term of a sequence?
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