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In a sequence of numbers in which each term after the first term is 1

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Joined: 02 Sep 2009
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In a sequence of numbers in which each term after the first term is 1  [#permalink]

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New post 30 Aug 2017, 06:02
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

79% (01:14) correct 21% (01:11) wrong based on 86 sessions

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Posts: 32
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Re: In a sequence of numbers in which each term after the first term is 1  [#permalink]

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New post 30 Aug 2017, 06:33
Is it D?

Explanation: 1) we have the first term for the series. Rest is just calculating based on the given condition.

2) Take first expression as x, use the given condition to evaluate 5th and 6th term. We will have a linear equation to get the value of x.

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Re: In a sequence of numbers in which each term after the first term is 1  [#permalink]

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New post 30 Aug 2017, 07:13
I think the answer would be E?

Using a linear equation of 2X + 1 = Y
Term 1: X = 1, Y = 3
Term 2: X = 3, Y = 7
Term 3: X = 7, Y = 15
Term 4: X = 15, Y = 31
Term 5: X = 31, Y = 63
Term 6: X = 63, Y = 127

127 - 63 = 64
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Re: In a sequence of numbers in which each term after the first term is 1  [#permalink]

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New post 30 Aug 2017, 09:14
The answer is D.

(1) give you the first term, so you can calculate the fifth term easily.
(2) we know that the sixth term is 1 more than twice the fifth, and its difference is 32. Call the fifth value is x, the difference can be formulated as 2x + 1 - x = x + 1 = 32 => x = 31
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Re: In a sequence of numbers in which each term after the first term is 1   [#permalink] 30 Aug 2017, 09:14
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In a sequence of numbers in which each term after the first term is 1

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