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# The positive sequence S1 , S2 , S3…Sn…is defined by Sn = Sn–1 + 5 for

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Joined: 02 Sep 2009
Posts: 53004
The positive sequence S1 , S2 , S3…Sn…is defined by Sn = Sn–1 + 5 for  [#permalink]

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05 Feb 2019, 01:59
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Difficulty:

25% (medium)

Question Stats:

86% (01:14) correct 14% (05:11) wrong based on 7 sessions

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The positive sequence S1, S2, S3…Sn…is defined by $$S_n = S_{n–1} + 5$$ for n ≥ 2. If $$S_1 = 7$$ then the nth term in the sequence is

A. 5n − 5
B. 5n − 2
C. 5n
D. 5n + 2
E. 5n + 7

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The positive sequence S1 , S2 , S3…Sn…is defined by Sn = Sn–1 + 5 for  [#permalink]

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05 Feb 2019, 02:06
Bunuel wrote:
The positive sequence S1, S2, S3…Sn…is defined by $$S_n = S_{n–1} + 5$$ for n ≥ 2. If $$S_1 = 7$$ then the nth term in the sequence is

A. 5n − 5
B. 5n − 2
C. 5n
D. 5n + 2
E. 5n + 7

IMO D

Each term is getting increased by 5

$$S_1 = 7$$
$$S_2 = 12$$
$$S_3 = 17$$

$$S_n = 5n+2$$

n=1 , 7
n=2, 12
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Re: The positive sequence S1 , S2 , S3…Sn…is defined by Sn = Sn–1 + 5 for  [#permalink]

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05 Feb 2019, 03:59
Bunuel wrote:
The positive sequence S1, S2, S3…Sn…is defined by $$S_n = S_{n–1} + 5$$ for n ≥ 2. If $$S_1 = 7$$ then the nth term in the sequence is

A. 5n − 5
B. 5n − 2
C. 5n
D. 5n + 2
E. 5n + 7

s1=7
s2=12
s3=17
5n+2 sufficient
IMO D
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Re: The positive sequence S1 , S2 , S3…Sn…is defined by Sn = Sn–1 + 5 for   [#permalink] 05 Feb 2019, 03:59
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