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The value of (2^(-14) + 2^(-15) + 2^(-16) + 2^(-17))/5 is

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The value of \(\frac{2^{(-14)} + 2^{(-15)} + 2^{(-16)} + 2^{(-17)}}{5}\) is how many times the value of \(2^{(-17)}\)?

A. 3/2
B. 5/2
C. 3
D. 4
E. 5
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Re: The value of (2^(-14) + 2^(-15) + 2^(-16) + 2^(-17))/5 is [#permalink]

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New post 09 May 2011, 07:31
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2^-14+2^-15+2^-16+2^-17/5

= 2^-17(2*3 + 2^2 + 2 + 1)/5

= = 2^-17 * 15/5 = 3(2^-17)

Answer - C
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Re: The value of (2^(-14) + 2^(-15) + 2^(-16) + 2^(-17))/5 is [#permalink]

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New post 09 May 2011, 07:44
2^(-14)/5 [ 1+ 2^(-1) + 2^(-2) + 2^(-3)]

2^(-14)/5 [ 3/2 + 3/2 * 1/4]

2^(-14)/5[3/2 * 5/4]

2^(-17)*3

Hence C.
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The value of (2^(-14) + 2^(-15) + 2^(-16) + 2^(-17))/5 is [#permalink]

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The value of \(\frac{2^{(-14)} + 2^{(-15)} + 2^{(-16)} + 2^{(-17)}}{5}\) is how many times the value of \(2^{(-17)}\)?

A. 3/2
B. 5/2
C. 3
D. 4
E. 5

Last edited by Bunuel on 19 Jul 2016, 21:58, edited 2 times in total.
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Re: The value of (2^(-14) + 2^(-15) + 2^(-16) + 2^(-17))/5 is [#permalink]

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andih wrote:
The value of (2^-14)+(2^-15)+(2^-16) + (2^-17) is how times the value of 2^-17?

A. 3/2

B. 5/2

C. 3

D. 4

E. 5


Original question reads:
The value of (2^(-14) + 2^(-15) + 2^(-16) + 2^(-17))/5 is how many times the value of 2^(-17)?

We need to find the value of: \(\frac{\frac{1}{5}*(2^{-14}+2^{-15}+2^{-16}+2^{-17})}{ 2^{-17}}=\frac{\frac{1}{5}*(\frac{1}{2^{14}}+\frac{1}{2^{15}}+\frac{1}{2^{16}}+\frac{1}{2^{17}})}{\frac{1}{2^{17}}}\).

Now, \(\frac{\frac{1}{5}*(\frac{1}{2^{14}}+\frac{1}{2^{15}}+\frac{1}{2^{16}}+\frac{1}{2^{17}})}{\frac{1}{2^{17}}}=\frac{2^{17}}{5}*(\frac{1}{2^{14}}+\frac{1}{2^{15}}+\frac{1}{2^{16}}+\frac{1}{2^{17}})=\frac{1}{5}*(2^3+2^2+2+1)=\frac{1}{5}*15=3\).

Answer: C.
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Re: The value of (2^(-14) + 2^(-15) + 2^(-16) + 2^(-17))/5 is [#permalink]

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if you take 2^(-17) common in the numerator, you will have 2^(-17) { 8 + 4 + 2 + 1} which equals 15.
This 15 cancels with 5 in the denominator and leaves {3} 2^-(17). Slightly quicker this way i feel.

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Re: The value of (2^(-14) + 2^(-15) + 2^(-16) + 2^(-17))/5 is [#permalink]

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Re: The value of (2^(-14) + 2^(-15) + 2^(-16) + 2^(-17))/5 is [#permalink]

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New post 09 Oct 2013, 20:41
Bunuel wrote:
andih wrote:
The value of (2^-14)+(2^-15)+(2^-16) + (2^-17) is how times the value of 2^-17?

A. 3/2

B. 5/2

C. 3

D. 4

E. 5


Original question reads:
The value of (2^(-14) + 2^(-15) + 2^(-16) + 2^(-17))/5 is how many times the value of 2^(-17)?

We need to find the value of: \(\frac{\frac{1}{5}*(2^{-14}+2^{-15}+2^{-16}+2^{-17})}{ 2^{-17}}=\frac{\frac{1}{5}*(\frac{1}{2^{14}}+\frac{1}{2^{15}}+\frac{1}{2^{16}}+\frac{1}{2^{17}})}{\frac{1}{2^{17}}}\).

Now, \(\frac{\frac{1}{5}*(\frac{1}{2^{14}}+\frac{1}{2^{15}}+\frac{1}{2^{16}}+\frac{1}{2^{17}})}{\frac{1}{2^{17}}}=\frac{2^{17}}{5}*(\frac{1}{2^{14}}+\frac{1}{2^{15}}+\frac{1}{2^{16}}+\frac{1}{2^{17}})=\frac{1}{5}*(2^3+2^2+2+1)=\frac{1}{5}*15=3\).

Answer: C.


Why do we divide by 2^-17?

Thanks,
C

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Re: The value of (2^(-14) + 2^(-15) + 2^(-16) + 2^(-17))/5 is [#permalink]

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New post 09 Oct 2013, 21:15
runningguy wrote:
Bunuel wrote:
andih wrote:
The value of (2^-14)+(2^-15)+(2^-16) + (2^-17) is how times the value of 2^-17?

A. 3/2

B. 5/2

C. 3

D. 4

E. 5


Original question reads:
The value of (2^(-14) + 2^(-15) + 2^(-16) + 2^(-17))/5 is how many times the value of 2^(-17)?

We need to find the value of: \(\frac{\frac{1}{5}*(2^{-14}+2^{-15}+2^{-16}+2^{-17})}{ 2^{-17}}=\frac{\frac{1}{5}*(\frac{1}{2^{14}}+\frac{1}{2^{15}}+\frac{1}{2^{16}}+\frac{1}{2^{17}})}{\frac{1}{2^{17}}}\).

Now, \(\frac{\frac{1}{5}*(\frac{1}{2^{14}}+\frac{1}{2^{15}}+\frac{1}{2^{16}}+\frac{1}{2^{17}})}{\frac{1}{2^{17}}}=\frac{2^{17}}{5}*(\frac{1}{2^{14}}+\frac{1}{2^{15}}+\frac{1}{2^{16}}+\frac{1}{2^{17}})=\frac{1}{5}*(2^3+2^2+2+1)=\frac{1}{5}*15=3\).

Answer: C.


Why do we divide by 2^-17?

Thanks,
C

It is given in the question.

We need to find "how many times the value of 2^(-17)" which means the entire expression is divided by 2^(-17). The quotient is the answer

Hope it is clear
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Re: The value of (2^(-14) + 2^(-15) + 2^(-16) + 2^(-17))/5 is [#permalink]

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andih wrote:
The value of \(2^{-14} + 2^{-15} + 2^{-16} + 2^{-17}/5\) is how many times the value of 2^{-17}?

A. 3/2
B. 5/2
C. 3
D. 4
E. 5


\(2^{-14} + 2^{-15} + 2^{-16} + 2^{-17}/5\) -----> Factor out from the nominator \(2^{-17}\)
\(2^{-17}(2^3+2^2+2^1+1)/5\)
\(2^{-17}(8+4+2+1)/5\)
\(2^{-17}*15/5\)
\(2^{-17}*3\)

Therefore, the equation is \(3\) times the value of \(2^{-17}\) and our answer is
[Reveal] Spoiler:
C


Comments please!

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Re: The value of (2^(-14) + 2^(-15) + 2^(-16) + 2^(-17))/5 is [#permalink]

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New post 26 Feb 2014, 02:56
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suk1234 wrote:
andih wrote:
The value of \(2^{-14} + 2^{-15} + 2^{-16} + 2^{-17}/5\) is how many times the value of 2^{-17}?

A. 3/2
B. 5/2
C. 3
D. 4
E. 5


\(2^{-14} + 2^{-15} + 2^{-16} + 2^{-17}/5\) -----> Factor out from the nominator \(2^{-17}\)
\(2^{-17}(2^3+2^2+2^1+1)/5\)
\(2^{-17}(8+4+2+1)/5\)
\(2^{-17}*15/5\)
\(2^{-17}*3\)

Therefore, the equation is \(3\) times the value of \(2^{-17}\) and our answer is
[Reveal] Spoiler:
C


Comments please!



How many times the value of 2^{-17} means just multiply the complete equation by 2^17 (Please note the power sign has been changed) & we get the answer

(8+4+2+1) / 5 = 3 = Answer = C
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Re: The value of (2^(-14) + 2^(-15) + 2^(-16) + 2^(-17))/5 is [#permalink]

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New post 30 Jun 2014, 18:31
The question asked
the value of (2^(-14) + 2^(-15) + 2^(-16) + 2^(-17))/5 is how many times the value of 2^(-17)?

Lets say (2^(-14) + 2^(-15) + 2^(-16) + 2^(-17))/5 = x* 2^(-17) --> (X times of 2^(-17)), So basically we need to find what is x ?

looks like we need to simplify the exponents to make given values in form desire one ..

lets Simplify Given Part , if we take 2^(-17) from numerator the simplified numerator will be ..

2^(-17)(2^(3) + 2^(2) + 2^(1) + 2^(0) )/5 = x*2^(-17)

why 2^(3) + 2^(2) ..... ? because if we want to make 2^(-17) = 2^(-14) we required to add 2^(3) positive power . same for other...


now divide 2^(-17) both side , x = (2^(3) + 2^(2) + 2^(1) + 2^(0) )/5 => x= (8+4+2+1)/5 => x =15/5 => x=3 Answer is C.

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Re: The value of (2^(-14) + 2^(-15) + 2^(-16) + 2^(-17))/5 is [#permalink]

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New post 12 Sep 2014, 01:53
hi according to answer 2^17 (Please note the power sign has been changed) & we get the answer

(8+4+2+1) / 5 = 3

how you reach this (8+4+2+1)????

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Re: The value of (2^(-14) + 2^(-15) + 2^(-16) + 2^(-17))/5 is [#permalink]

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Re: The value of (2^(-14) + 2^(-15) + 2^(-16) + 2^(-17))/5 is [#permalink]

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New post 06 Jun 2016, 08:45
(2^-14 + 2^-15 + 2^-16 + 2^-17)/5 = 2^-17*(2^3 + 2^2 + 2 + 1) / 5
= 2^-17 * (15)/5 = 2^-17 * 3

Correct Option: C
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Re: The value of (2^(-14) + 2^(-15) + 2^(-16) + 2^(-17))/5 is [#permalink]

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New post 21 Jul 2016, 10:41
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carollu wrote:
The value of \(\frac{2^{(-14)} + 2^{(-15)} + 2^{(-16)} + 2^{(-17)}}{5}\) is how many times the value of \(2^{(-17)}\)?

A. 3/2
B. 5/2
C. 3
D. 4
E. 5



We start by translating the question. We are asked (2^-14) + (2^-15) + (2^-16) + (2^-17) is how times the value of 2^-17. We can express it as the following:

Image

The answer is C.
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Re: The value of (2^(-14) + 2^(-15) + 2^(-16) + 2^(-17))/5 is [#permalink]

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New post 22 Aug 2016, 15:15
I think we can solve it another way.
please expert correct me if I am wrong.
2^(-17)* (2^3+2^2+2^1+1)/5 = 2^(-17)*(8+4+2+1)/5
2^(-17)*(15)/5 = 2^(-17)*(3)
So finally, (2^(-14) + 2^(-15) + 2^(-16) + 2^(-17))/5 is 3 time 2^(-17).
I think It is simple and direct. but one should get the idea. It is wordy and looks complicated and let me be scared.

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Re: The value of (2^(-14) + 2^(-15) + 2^(-16) + 2^(-17))/5 is [#permalink]

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Riffing on Scott's solution above. Instead of 'pulling out' a 2^-17, you can multiply both sides by 2^17 to simplify all of the exponents.
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The value of (2^(-14) + 2^(-15) + 2^(-16) + 2^(-17))/5 is [#permalink]

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New post 27 May 2017, 09:27
Is it possible for us to just assume that 2^\({-14}\) + 2^ \({-15}\) .... is the same as 2^\({-1}\) + 2^ \({-2}\)+ 2^ \({-3}\)+ 2^ \({-4}\) /5?


for me it worked well.... then we need to know how much is 2^ \({-4}\) from that expression

it will give us \((\frac{1}{2}+\frac{1}{4}+ \frac{1}{8}+ \frac{1}{16})/5\) which is equal to 15/80 -> or 3/16........ which is 3 times 2^ \({-4}\)

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The value of (2^(-14) + 2^(-15) + 2^(-16) + 2^(-17))/5 is [#permalink]

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New post 14 Aug 2017, 11:29
carollu wrote:
The value of \(\frac{2^{(-14)} + 2^{(-15)} + 2^{(-16)} + 2^{(-17)}}{5}\) is how many times the value of \(2^{(-17)}\)?

A. 3/2
B. 5/2
C. 3
D. 4
E. 5



hi

what is wrong with below ...?

2^-14( 1 + 1/2 + 1/4 + 1/8)

= 2^-14 x 15/8 x 1/5

= 2^-14 x 3/8

now it is 2^-14 x 3/8 x 1/2^17..

= 3 times

anticipating experts' sage advice ....

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The value of (2^(-14) + 2^(-15) + 2^(-16) + 2^(-17))/5 is   [#permalink] 14 Aug 2017, 11:29

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