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Re: If the tick marks on the number line below are evenly spaced [#permalink]
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bim1946 wrote:
isn't it inc exponentially so we need to go back which is 2 on reaching X?


It is not increasing exponentially. The questions states that each two tick are evenly spaced so all the tick are distant 2^6 - 2^5 = 32 or 2^5.
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Re: If the tick marks on the number line below are evenly spaced [#permalink]
Carcass wrote:

This question is part of GREPrepClub - The Questions Vault Project



If the tick marks on the number line below are evenly spaced, what value is represented by x?

< ---------- \(X\) -----------------| -----------------|-------------------|-------------- \(2^5\) --------------- \(2^6\) ------------- | --------->

A. \(2^0\)

B. \(2\)

C. \(-2 * 2^5\)

D. \(-3 * 2^5\)

E. \(-4 * 2^5\)
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Re: If the tick marks on the number line below are evenly spaced [#permalink]
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Carcass wrote:

This question is part of GREPrepClub - The Questions Vault Project



If the tick marks on the number line below are evenly spaced, what value is represented by x?

< ---------- \(X\) -----------------| -----------------|-------------------|-------------- \(2^5\) --------------- \(2^6\) ------------- | --------->

A. \(2^0\)

B. \(2\)

C. \(-2 * 2^5\)

D. \(-3 * 2\)^5

E. \(-4 * 2^5\)


Let's assign some variables to some of the tick marks:
Image

Let's first determine the distance between two tick marks.
\(2^6-2^5 = 2^5(2-1) = 2^5\)
So, the distance between consecutive tick marks is \(2^5\)

This means U = \(2^5-2^5 = 0\)
And V = \(0-2^5 = -2^5\)
And W = \(-2^5-2^5 = -2(2^5)\)
And X = \(-2(2^5)-2^5 = -3(2^5)\)

Answer: D
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Re: If the tick marks on the number line below are evenly spaced [#permalink]
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The difference between each even space = 2^6 - 2^5 = 2^5 = 32.

Since X is 4 'even spaces' to the left of 2^5 = 32, then it is 4*32 units less than 32.

4*32 units less than 32 is also 3*32 units less than zero when you remove one 32 which is -96.

X = -96

Prime factorisation of -96 is as follows:

x = - 96
= -(2*48)
= -2*2*24
= -2*2*2*12
= -2*2*2*2*6
= -2*2*2*2*2*3
= -2^5*3
= -3*2^5

The correct answer is D.
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Re: If the tick marks on the number line below are evenly spaced [#permalink]
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Re: If the tick marks on the number line below are evenly spaced [#permalink]
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