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Any decimal that has only a finite number of nonzero digits

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Any decimal that has only a finite number of nonzero digits [#permalink] New post 17 Feb 2010, 15:58
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Any decimal that has only a finite number of nonzero digits is a terminating decimal. For example, 36, 0.72, and 3.005 are terminating decimals. If a, b, c, d and e are non-negative integers and p=2^a*3^b and q=2^c*3^d*5^e, is p/q a terminating decimal?

(1) a > c

(2) b > d
[Reveal] Spoiler: OA

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Re: terminating decimal! [#permalink] New post 17 Feb 2010, 16:30
Interesting question and what nitish suggested was a good formula but when you apply it, the answer should actually be different.

The answer should be A. Only statement 1 is sufficient to say that the ratio p/q is non-terminating definitively.

Stmt-1 deals with the relationship between a and c, so we know clearly that 2 will not be there in the denominator.

Stmt-2 on the other hand relates b with d, so we don't know if 2 will be there in the denominator or not.

2^a/2^c = 2^(a - c) when a > c in the numerator and will be 1/2^(c - a) when a < c.

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Re: terminating decimal! [#permalink] New post 17 Feb 2010, 16:46
BarneyStinson wrote:
Interesting question and what nitish suggested was a good formula but when you apply it, the answer should actually be different.

The answer should be A. Only statement 1 is sufficient to say that the ratio p/q is non-terminating definitively.

Stmt-1 deals with the relationship between a and c, so we know clearly that 2 will not be there in the denominator.

Stmt-2 on the other hand relates b with d, so we don't know if 2 will be there in the denominator or not.

2^a/2^c = 2^(a - c) when a > c in the numerator and will be 1/2^(c - a) when a < c.



Can you explain why A is the answer?

I guess A only tells us that 2 wont be there in the denominator but does not tell us anything about 3, and now if 3 will be there in the denominator it will be non terminating decimal but if 3 wont be there then it will be a terminating decimal and hence its not sufficient

on the other hand st 2 clearly tells that 3 wont be there in the denominator and hence its sufficient.

Correct me if I am missing some thing here ..!
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Re: terminating decimal! [#permalink] New post 18 Feb 2010, 06:12
vscid wrote:
nitishmahajan wrote:
vscid wrote:
Any decimal that has only a finite number of nonzero digits is a terminating decimal. For example, 36, 0.72, and 3.005 are terminating decimals.
If a, b, c, d and e are non-negative integers and p = 2^a3^b and q = 2^c3^d5^e, is p/q a terminating decimal?

(1) a > c

(2) b > d


IMO B,

For any number to be a terminating decimal. Denominator should be in the format 2^x * 5^y.


Nitish,
Is this a rule for a number to be terminating decimal ?


I'm not Nitish, but if I can answer your question, then yes, it is a rule. For the number to be a terminating decimal in denominator it has to have 2^x*5^y and x or y can be 0
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Re: terminating decimal! [#permalink] New post 18 Feb 2010, 07:37
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vscid wrote:
nitishmahajan wrote:
vscid wrote:
Any decimal that has only a finite number of nonzero digits is a terminating decimal. For example, 36, 0.72, and 3.005 are terminating decimals.
If a, b, c, d and e are non-negative integers and p = 2^a3^b and q = 2^c3^d5^e, is p/q a terminating decimal?

(1) a > c

(2) b > d


IMO B,

For any number to be a terminating decimal. Denominator should be in the format 2^x * 5^y.


Nitish,
Is this a rule for a number to be terminating decimal ?


Theory:
Reduced fraction \frac{a}{b} (meaning that fraction is already reduced to its lowest term) can be expressed as terminating decimal if and only b (denominator) is of the form 2^n5^m, where m and n are non-negative integers. For example: \frac{7}{250} is a terminating decimal 0.028, as 250 (denominator) equals to 2*5^2. Fraction \frac{3}{30} is also a terminating decimal, as \frac{3}{30}=\frac{1}{10} and denominator 10=2*5.

Note that if denominator already has only 2-s and/or 5-s then it doesn't matter whether the fraction is reduced or not.

For example \frac{x}{2^n5^m}, (where x, n and m are integers) will always be the terminating decimal.

We need reducing in case when we have the prime in denominator other then 2 or 5 to see whether it could be reduced. For example fraction \frac{6}{15} has 3 as prime in denominator and we need to know if it can be reduced.

Hope it helps.

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Re: terminating decimal! [#permalink] New post 20 Feb 2010, 02:10
vscid wrote:
Any decimal that has only a finite number of nonzero digits is a terminating decimal. For example, 36, 0.72, and 3.005 are terminating decimals.
If a, b, c, d and e are non-negative integers and p = 2^a3^b and q = 2^c3^d5^e, is p/q a terminating decimal?

(1) a > c

(2) b > d


IMO B..

Explanation:

\frac{p}{q} = \frac{2^a*3^b}{2^c*3^d*5^e}

For any fraction to be terminating... the denominator should be in form of 2^m*5^n in it's lowest form where m and n are non negative integers - could be 0 also...

1. a > c
Therefore a-c (let say k) > 0

Hence:
\frac{p}{q} = \frac{2^k*3^b}{3^d*5^e}... which is could be a terminating decimal if b>d... or non terminating... if b<d. INSUFF...

For example the fraction could be .... \frac{4*3}{2*9*5}=0.13333... or \frac{4*9}{2*3*5}=0.12

2. b>d
Therefore b-c (let say n) > 0
Hence:
\frac{p}{q} = \frac{2^a*3^n}{2^c*5^e}... This is clearly a terminating decimal as the denominator would be in a form of 2^m*5^n

For example the fraction could be .... \frac{4*3}{2*5}=0.12 or \frac{4*3}{8*5}=0.3

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Re: terminating decimal! [#permalink] New post 25 Apr 2011, 07:13
1. Not sufficient
As 3 will be there in denominator or not.

2.sufficient
As we know 3 is not in the denominator and denominator has a 5.

Answer is B.

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Re: Any decimal that has only a finite number of nonzero digits [#permalink] New post 25 May 2012, 19:14
picked B. knew that 2/5 in the denominator will lead to a terminating decimal irrespective of a numerator. However didnt know of the formal rule. very helpful.
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Re: terminal decimal [#permalink] New post 09 Jun 2012, 21:04
Hi,

p = 2^a3^b and q = 2^c3^d5^e
p/q = 2^(a-c)3^(b-d)5^(-e)

division by 2 or 5 (raised to any power will result to terminating decimal)

only check is on b-d

so, using (2)
b-d > 0,
thus 3 is not in denominator, hence p/q is terminating decimal.

Answer is (B).

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Re: terminal decimal [#permalink] New post 13 Jun 2012, 22:37
Bunuel wrote:
alchemist009 wrote:
Any decimal that has only a finite number of nonzero digits is a terminating decimal. For example, 36, 0.72, and 3.005 are terminating decimals.

If a, b, c, d and e are non-negative integers and p = 2^a3^b and q = 2^c3^d5^e, is p/q a terminating decimal?

(1) a > c

(2) b > d


Merging similar topics. Please refer to the solutions above.




Bunuel,

if denominator has only 2 or only 5, it seems that the fraction will also be a terminating decimal. Right?
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Re: Any decimal that has only a finite number of nonzero digits [#permalink] New post 13 Jun 2012, 22:41
My answer is B. What's the OA?

The only determinant if p/q is a terminating decimal is 3^b/3^d since a fraction with the format a/b is terminal if b is a power of 2 or 5 or both.

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Re: terminal decimal [#permalink] New post 13 Jun 2012, 23:31
Expert's post
Rice wrote:
Bunuel wrote:
alchemist009 wrote:
Any decimal that has only a finite number of nonzero digits is a terminating decimal. For example, 36, 0.72, and 3.005 are terminating decimals.

If a, b, c, d and e are non-negative integers and p = 2^a3^b and q = 2^c3^d5^e, is p/q a terminating decimal?

(1) a > c

(2) b > d


Merging similar topics. Please refer to the solutions above.




Bunuel,

if denominator has only 2 or only 5, it seems that the fraction will also be a terminating decimal. Right?


Yes.

Reduced fraction \frac{a}{b} (meaning that fraction is already reduced to its lowest term) can be expressed as terminating decimal if and only b (denominator) is of the form 2^n5^m, where m and n are non-negative integers.

Notice that when n or m equals to zero then the denominator will have only 2's or 5's.

Hope it's clear.

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Re: Any decimal that has only a finite number of nonzero digits [#permalink] New post 13 Jun 2012, 23:40
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gmatsaga wrote:
My answer is B. What's the OA?

The only determinant if p/q is a terminating decimal is 3^b/3^d since a fraction with the format a/b is terminal if b is a power of 2 or 5 or both.


OA is given in the initial post and it's B.

Any decimal that has only a finite number of nonzero digits is a terminating decimal. For example, 36, 0.72, and 3.005 are terminating decimals. If a, b, c, d and e are non-negative integers and p=2^a*3^b and q=2^c*3^d*5^e, is p/q a terminating decimal?

(1) a > c
(2) b > d

Check this: any-decimal-that-has-only-a-finite-number-of-nonzero-digits-90504.html#p689656

So, according to that \frac{p}{q}=\frac{2^a*3^b}{2^c*3^d*5^e} will be terminating decimal if 3^d in the denominator can be reduced, which will happen when the power of 3 in the numerator is more than or equal to the power of 3 in the denominator, so when b\geq{d}.

As we can see (1) is completely irrelevant to answer whether b\geq{d}, while (2) directly answers the question by stating that b>d.

Answer: B.

Hope it's clear.

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Re: Any decimal that has only a finite number of nonzero digits [#permalink] New post 21 Jul 2012, 06:14
In the given problem, if a and c are not considered, then there may be a case when 2^a can be completely divided by 2^c, in that case, how the answer can be b? or if a-c is positive. Please let me know where am I thinking wrong?
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Re: Any decimal that has only a finite number of nonzero digits [#permalink] New post 22 Jul 2012, 02:32
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pavanpuneet wrote:
In the given problem, if a and c are not considered, then there may be a case when 2^a can be completely divided by 2^c, in that case, how the answer can be b? or if a-c is positive. Please let me know where am I thinking wrong?


Not sure I understand what you mean above. What difference does it make whether 2^a is reduced or not? Or whether a-c is positive?

Please read this: any-decimal-that-has-only-a-finite-number-of-nonzero-digits-90504.html#p689656 and this: any-decimal-that-has-only-a-finite-number-of-nonzero-digits-90504.html#p1096496 for theory.

Solution: any-decimal-that-has-only-a-finite-number-of-nonzero-digits-90504.html#p1096500

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Re: Any decimal that has only a finite number of nonzero digits [#permalink] New post 28 Jul 2012, 23:21
If the denominator in a fraction has only 2 or/and 5 --> terminating decimal
If the denominator has any other prime factor other than 2 or 5 --> non-terminating decimal.


Hence is this question, we need to find out if 3 will be present in the denominator or not! . which means we need to find out if b > d .
Hence OA : B.

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Re: Any decimal that has only a finite number of nonzero digits [#permalink] New post 11 Aug 2012, 05:15
vscid wrote:
Any decimal that has only a finite number of nonzero digits is a terminating decimal. For example, 36, 0.72, and 3.005 are terminating decimals. If a, b, c, d and e are non-negative integers and p=2^a*3^b and q=2^c*3^d*5^e, is p/q a terminating decimal?

(1) a > c

(2) b > d


p/q = (2^a * 3^b) / (2^c * 3^d * 5^e)
= [2^(a-c) * 3(b-d)] / 5^e

A/B will be terminating(T) only if 1/B is T.
B = 1/5^e will be always T , in the same way as 1/3^e will always be non- terminating(NT).
Product of a NT with a T will always be NT.

In the numerator of p/q, powers of 2 and 3 can be +ve or -ve. Power of 2 doesn't have any affect on the T behaviour of p/q, but if power of 3 is -ve, it will go down to denominator and 1/3^x is always NT and make p/q NT.

stmt 1: a > c means power of 2 will be positive - INSUFFICIENT.
stmt 2: b > d means power of 3 will be positive and 3^(b-d) will remain in the numerator. Thus, p/q will be T. SUFFICIENT

Answer is B

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Re: Any decimal that has only a finite number of nonzero digits [#permalink] New post 25 Jun 2014, 05:05
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