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Answer to Question #989 in Algebra for gabriel

Question #989
how do you figure out a a formula for a sequence than whats the ninth term, Ex 2 4 6 8
Expert's answer
It's the aruthmetic progression, a[n] = a1 +(n-1)*b, where b = 2, a1 = 2;
so
a[9] = 2 + (9-1)*2 = 18.

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