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Math Expert V
Joined: 02 Sep 2009
Posts: 59020
Given an arithmetic sequence of N terms in which the common difference  [#permalink]

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Difficulty:   25% (medium)

Question Stats: 83% (00:36) correct 17% (00:30) wrong based on 23 sessions

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Given an arithmetic sequence of N terms in which the common difference between terms is 2, what is the value of N?

(1) The first term is 18.
(2) The last term is 70.

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Senior Manager  P
Joined: 10 Apr 2018
Posts: 277
Location: India
Concentration: General Management, Operations
GMAT 1: 680 Q48 V34 GPA: 3.3
Given an arithmetic sequence of N terms in which the common difference  [#permalink]

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Bunuel wrote:
Given an arithmetic sequence of N terms in which the common difference between terms is 2, what is the value of N?

(1) The first term is 18.
(2) The last term is 70.

(1) Since we don't know the value of last term, we can't find the value of N.
Thus, insufficient.

(2) Since we don't know the value of first term, we can't find the value of N.
Thus, insufficient.

From (1) and (2) together, we get,
70= 18+(N-1)*2
From the above equation we can find the value of N.
Thus, sufficient.

Therefore, the answer is option C. Given an arithmetic sequence of N terms in which the common difference   [#permalink] 11 Oct 2019, 23:22
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# Given an arithmetic sequence of N terms in which the common difference  