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Increase of +220th term x 2 = 40(take away the first 4 terms)40 - (4 x 2) = 32By formula method:This is an arithmetic progression.First term is a = --6; common difference d = +2 the expected term n = 20By formula, tn = a + (n--1)dHence plugging, the required 20th term is --6 + 38 = 32
The sequence is Un = 19 - 3n so the 20th term is 19 - 3*20 = 19 - 60 = -41
210
840
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.