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#### Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here. # Let x1, x2, x3......xn be a sequence of positive numbers whe  Question banks Downloads My Bookmarks Reviews Important topics
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Founder  Joined: 18 Apr 2015
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Let x1, x2, x3......xn be a sequence of positive numbers whe [#permalink]
Expert's post 00:00

Question Stats: 80% (02:03) correct 20% (01:58) wrong based on 10 sessions
Let x1, x2, x3......xn be a sequence of positive numbers where X1 = 1, and Xn+1 = Xn + 4. What represents the nth term in the sequence?

A. -3n

B. 3n - 4

C. 4n - 3

D. 4n - 4

E. 5n
[Reveal] Spoiler: OA

_________________ Director  Joined: 07 Jan 2018
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Re: Let x1, x2, x3......xn be a sequence of positive numbers whe [#permalink]
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$$1$$st term $$= 1$$ (given)
$$2$$nd term $$= 1 + 4 = 5$$
$$3$$rd term $$= 5 + 4 = 9$$
We have $$5$$ ans choices each expression contains $$n$$ which is the number of terms
Equating each expression with a term in our sequence should give us the ans
let us suppose 2nd term which is $$5$$

Among the ans choices whichever returns with a value for $$n = 2$$ is the ans

option c does exactly that when $$4n -3 =5$$
or, $$4n = 8$$ hence, $$n = 2$$
option c
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This is my response to the question and may be incorrect. Feel free to rectify any mistakes Re: Let x1, x2, x3......xn be a sequence of positive numbers whe   [#permalink] 16 Apr 2018, 01:33
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