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If a is divisible by 5!, then a/4 must be

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If a is divisible by 5!, then a/4 must be [#permalink]

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New post 03 Nov 2016, 02:15
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If a is divisible by 5!, then a/4 must be

I. an odd integer
II. a multiple of 3
III. a multiple of 10

A. I only
B. II only
C. III only
D. I and III only
E. II and III only
[Reveal] Spoiler: OA

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Re: If a is divisible by 5!, then a/4 must be [#permalink]

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New post 03 Nov 2016, 02:23
Bunuel wrote:
If a is divisible by 5!, then a/4 must be

I. an odd integer
II. a multiple of 3
III. a multiple of 10

A. I only
B. II only
C. III only
D. I and III only
E. II and III only


IMO E
If a is divisible by 5! then a must be of the form 120*k when k is an integer 1, 2, 3
then a can be 120, 240, 360, 480....
a/4= 30, 60, 90, 120.....
from this we can say a/4 satisfies E.

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If a is divisible by 5!, then a/4 must be [#permalink]

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New post 03 Nov 2016, 02:38
Nice Question.
This is a must be true question.
Statement 1 => a/4 must be odd
Hmm Let a = 5! => clearly a/4 is even>
Hence 1 must not be true.
Statement 2 => of course it will be true as a must contain a 3 => a/4 must be a multiple of 3
statement 3 => Officourse the least value of a is 5! and 5!/4 is clearly divisibly by 10
Hence E
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Re: If a is divisible by 5!, then a/4 must be [#permalink]

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New post 03 Nov 2016, 03:26
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Bunuel wrote:
If a is divisible by 5!, then a/4 must be

I. an odd integer
II. a multiple of 3
III. a multiple of 10

A. I only
B. II only
C. III only
D. I and III only
E. II and III only


IMO it is (E)

a is divisible by 5*4*3*2
a/4 is divisible by 5*3*2

I is not odd integer hence No
II a multiple of 3 Yes
III a multiple of 10 Yes
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Re: If a is divisible by 5!, then a/4 must be [#permalink]

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New post 03 Nov 2016, 03:35
I getting E.

a/2*3*4*5*4 = a/ 240

so a must be divisible by 3 and 10 but need not necessarily be an odd number

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Re: If a is divisible by 5!, then a/4 must be [#permalink]

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New post 03 Nov 2016, 06:43
If a is divisible by 5!, then a/4 must be

a = 5*4*3*2*1*K (K = integer)

a/4 = 5*3*2*1*K

I. an odd integer
a/4 contains a 2. This cannot be odd. Eliminate.

II. a multiple of 3
a/4 contains a 3. Is a multiple of 3. Retain.

III. a multiple of 10
a/4 contains 5 & 2. Retain

Answer = E. II and III only
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Re: If a is divisible by 5!, then a/4 must be [#permalink]

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New post 03 Nov 2016, 06:57
Bunuel wrote:
If a is divisible by 5!, then a/4 must be

I. an odd integer
II. a multiple of 3
III. a multiple of 10

A. I only
B. II only
C. III only
D. I and III only
E. II and III only


5! = 120

Now Check the options -

I. a/120 can be ODD/EVEN

a = 240
a/120 = 2

a = 360
a/120 =3

II. Since 5! = 120 a multiple of 3 , any number " a "will be a multiple of 3

III. Since 5! = 120 a multiple of 10 , any number " a " will be a multiple of 10

Thus only option (E) is true...
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Re: If a is divisible by 5!, then a/4 must be [#permalink]

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New post 03 Nov 2016, 07:14
If a is divisible by 5! ie a is divisible by 2,3,4,5.
So a/4 is divisible by 2,3,5.

I) Is it odd integer? No, as it is still divisible by 2
II) Is it multiple of 3? Yes, as it is divisible by 3
III) Is it multiple of 10? Yes, as it is divisible by 2 and 5

So answer is Only II and III ie E

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Re: If a is divisible by 5!, then a/4 must be [#permalink]

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New post 03 Nov 2016, 07:22
Bunuel wrote:
If a is divisible by 5!, then a/4 must be

I. an odd integer
II. a multiple of 3
III. a multiple of 10

A. I only
B. II only
C. III only
D. I and III only
E. II and III only


first of all, 5! = 1*2*3*4*5

a/4 = 1*2*3*5 - an even number. I is not true. A and D are out.
II - we have a factor of 3, so yes, IT IS a multiple of 3. C is out.
III - we have a factor of 2 and a factor of 5 - so yes, IT IS a multiple of 10. B is out.

the answer is E.

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Re: If a is divisible by 5!, then a/4 must be [#permalink]

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New post 04 Nov 2016, 15:16
Bunuel wrote:
If a is divisible by 5!, then a/4 must be

I. an odd integer
II. a multiple of 3
III. a multiple of 10

A. I only
B. II only
C. III only
D. I and III only
E. II and III only


Since 5! = 5 x 4 x 3 x 2 x 1 = 120, and a is divisible by 5!, we know that a is divisible by some multiple of 120. However since we are determining what MUST be true, we can set a equal to the smallest positive multiple of 120, which is 120.


Thus a/4 = 120/4 = 30.

Now we can analyze each Roman numeral.

I. a/4 is an odd integer

Since 120/4 = 30, a/4 does not have to result in an odd integer. Roman numeral one is not correct.

II. a/4 is a multiple of 3

Since 120/4 = 30, a/4 will always be a multiple of 3, Roman numeral II is correct.

III. a/4 is a multiple of 10

Since 120/4 = 30, a/4 will always be a multiple of 10, Roman numeral III is correct.

Answer: E
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Re: If a is divisible by 5!, then a/4 must be [#permalink]

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New post 04 Nov 2016, 21:18
Bunuel wrote:
If a is divisible by 5!, then a/4 must be

I. an odd integer
II. a multiple of 3
III. a multiple of 10

A. I only
B. II only
C. III only
D. I and III only
E. II and III only


a is divisible by 5! i.e. a is a multiple of 120

i.e. then a/4 must be a multiple of 120/4 = multiple of 30
Which is Even, a multiple of 3 and a multiple of 10 as well

Hence
Answer: Option E
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Re: If a is divisible by 5!, then a/4 must be [#permalink]

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New post 03 Dec 2017, 07:22
Bunuel wrote:
If a is divisible by 5!, then a/4 must be

I. an odd integer
II. a multiple of 3
III. a multiple of 10

A. I only
B. II only
C. III only
D. I and III only
E. II and III only


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New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
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Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


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Re: If a is divisible by 5!, then a/4 must be   [#permalink] 03 Dec 2017, 07:22
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