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As can be seen, each succesive term is 2 greater than the last. We can write a rule to calculate the nth term. Here the rule equals 2n - 8. So the 20th term = (2 * 20) - 8 = 32.
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first square the first term then multiply the first and second term and multiply by 2 finally square the second term
term n = 3n - 1 for n = 1, 2, 3, ...