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GRE Prep Club Team Member
Joined: 20 Feb 2017
Posts: 2506
Given Kudos: 1055
GPA: 3.39
Paul is planning to save $1 this week and then save $1 more each succe
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31 Jan 2023, 00:27
31 Jan 2023, 00:27
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Paul is planning to save $1 this week and then save $1 more each succeeding week than he saves the week before. His goal is to save $210. Using his knowledge that the sum S of the first n consecutive positive integers is \(S = \frac{n(n + 1)}{2}\), where n > 1, he can determine that it will take him how many weeks to reach his goal ?
A. 10
B. 11
C. 15
D. 20
E. 21
A. 10
B. 11
C. 15
D. 20
E. 21
GRE Prep Club Team Member
Joined: 20 Feb 2017
Posts: 2506
Given Kudos: 1055
GPA: 3.39
Re: Paul is planning to save $1 this week and then save $1 more each succe
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01 Feb 2023, 21:41
01 Feb 2023, 21:41
Expert Reply
target sum $210
using given formula
420= n*(n+1)
plug in answer option; 20
Answer: D
using given formula
420= n*(n+1)
plug in answer option; 20
Answer: D
gmatclubot
Re: Paul is planning to save $1 this week and then save $1 more each succe [#permalink]
01 Feb 2023, 21:41
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