# Answer on Algebra Question 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] = a

so

a[9] = 2 + (9-1)*2 = 18.

_{1}+(n-1)*b, where b = 2, a_{1}= 2;so

a[9] = 2 + (9-1)*2 = 18.

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