Question

The common difference of an arithmetic sequence is 6 and its one term is 45.
Is 2018, the sum of any 15 terms of this sequence? Why?

Answer 1

Answer:

129

Step-by-step explanation:

d = 6, a = 45, n = 15, a15=?

a15=a+(n-1) d

a15=45+(15-1)6

a15=45+(14)6

a15=45+84

a15=129.

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