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Let x1, x2, x3......xn be a sequence of positive numbers whe

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Let x1, x2, x3......xn be a sequence of positive numbers whe [#permalink] New post 15 Apr 2018, 08:24
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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

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Re: Let x1, x2, x3......xn be a sequence of positive numbers whe [#permalink] New post 16 Apr 2018, 01:33
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1st term = 1 (given)
2nd term = 1 + 4 = 5
3rd 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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Re: Let x1, x2, x3......xn be a sequence of positive numbers whe   [#permalink] 16 Apr 2018, 01:33
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Let x1, x2, x3......xn be a sequence of positive numbers whe

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