Math problem. Please help!?

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Math problem. Please help!?

A sequence is formed by the three repeating integers that follow. What is the sum of the first 18 terms in the sequence?

4, 1, -3, ...

(A) 5
(B) 12
(C) 18
(D) 30
(E) -12

The answer *should* be (B)12 but how? and why? Makes no sense!

2007-06-13 07:35:52 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics

3 answers

Add those three numbers: 4 + 1 - 3 = 2. Since you want the sum of the first 18 numbers, you get 6 groups of the first three. 6 * 2 = 12.

2007-06-13 07:38:26 · answer #1 · answered by Mathsorcerer 7 · 0⤊ 0⤋

4 1 -3 4 1 -3 4 1 -3 4 1 -3 4 1 -3 4 1 -3

12

2007-06-13 14:44:06 · answer #2 · answered by bob h 3 · 0⤊ 0⤋

2007-06-13 14:40:19 · answer #3 · answered by Emme 1 · 0⤊ 0⤋