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In the sequence S, s1 = 4, s2 = 11, and s3 = 18. Which of the followin

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Joined: 02 Sep 2009
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In the sequence S, s1 = 4, s2 = 11, and s3 = 18. Which of the followin  [#permalink]

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21 Jan 2019, 23:56
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In the sequence S, $$s_1 = 4$$, $$s_2 = 11$$, and $$s_3 = 18$$. Which of the following could be the definition of the sequence?

A $$s_n = s_{n−1} + 4$$

B $$s_n = 2s_{n−1} + 3$$

C $$s_n = s_{n−1} + 7$$

D $$s_n = 2s_{n−1} – 4$$

E $$s_n = s_{n−1} – 7$$

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Re: In the sequence S, s1 = 4, s2 = 11, and s3 = 18. Which of the followin  [#permalink]

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22 Jan 2019, 04:11
Bunuel wrote:
In the sequence S, $$s_1 = 4$$, $$s_2 = 11$$, and $$s_3 = 18$$. Which of the following could be the definition of the sequence?

A $$s_n = s_{n−1} + 4$$

B $$s_n = 2s_{n−1} + 3$$

C $$s_n = s_{n−1} + 7$$

D $$s_n = 2s_{n−1} – 4$$

E $$s_n = s_{n−1} – 7$$

plug in for values
we would get c as correct
IMO C
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Joined: 15 Sep 2013
Posts: 14
Re: In the sequence S, s1 = 4, s2 = 11, and s3 = 18. Which of the followin  [#permalink]

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07 Mar 2019, 00:18
how to do this faster? I can only solve it more than 2:30 minutes
Re: In the sequence S, s1 = 4, s2 = 11, and s3 = 18. Which of the followin   [#permalink] 07 Mar 2019, 00:18
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