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Which of the following is NOT a factor of the product of the

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Which of the following is NOT a factor of the product of the  [#permalink]

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New post 14 Aug 2013, 21:06
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Which of the following is NOT a factor of the product of the first 50 positive multiples of 4 ?

A. \(17^2\)
B. \(11^4\)
C. \(7^6\)
D. \(47^{12}\)
E. \(2^{124}\)

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Which of the following is NOT a factor of the product of the  [#permalink]

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New post 14 Aug 2013, 21:18
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gmatpapa wrote:
Which of the following is NOT a factor of the product of the first 50 positive multiples of 4 ?

A. \(17^2\)
B. \(11^4\)
C. \(7^6\)
D. \(47^{12}\)
E. \(2^{124}\)



product of the first 50 positive multiples of 4 = 4*8*12*16*......200 =4^50*(1*2*3......49*50) = 2^100(FACTORIAL 50)

lets check options:

A. \(17^2\) ==>we need two 17 ==>that can be found in FACTORIAL 50 (17,34)=>factor

B. \(11^4\) ==>we need four 11==> that can be found in FACTORIAL 50 (11,22,33,44)=>factor

C. \(7^6\) ==>we need six 7 ==>that can be found in FACTORIAL 50(7,14,21,28,35,42)=>factor

D. \(47^{12}\)==>not a factor since we 47 is a prime and is only 1 time present in factorial 50

E. \(2^{124}\)==>This can be found as we have 2 ^100 and in factorial 50 we have 25 even numbers=>factor

hence D
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Re: Which of the following is NOT a factor of the product of the  [#permalink]

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New post 15 Aug 2013, 06:08
gmatpapa wrote:
Which of the following is NOT a factor of the product of the first 50 positive multiples of 4 ?

A. \(17^2\)
B. \(11^4\)
C. \(7^6\)
D. \(47^{12}\)
E. \(2^{124}\)

4^50×(1.2.3.4.5.6.7..............................50)

= 4^50 (1.2.3.4.................50)

17^2 = 17 ×17 (we have 17 and 34) so this is a factor.

11× 11× 11× 11 (we have 11,22,33,44) so this is a factor.

7 × 7× 7× 7 ×7 ×7 (we have 7,14,21,28,35,42) so this is a factor.

2^124 = (4)^62 . Now 4^50 / 4^62 = 1/4^12 = 1/(4 . 4 . 4. 4. 4. 4. 4. 4. 4. 4. 4. 4) we have (4,8,12,16,20,24,28,32,36,40,44,48) . so this is also a factor.

These left only one as the guilty and it's 47^12
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Re: Which of the following is NOT a factor of the product of the  [#permalink]

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New post 15 Jan 2017, 09:14
Firstly the product of first positive 50 multiples of 4=>
4*1*4*2*4*3*4*4*4*5.....4*50=> 4^50*50!
Secondly notice Option D is 47^2 and 47 is a prime number.
Number of 47's in 4^50*50!=> one
Hence 47^2 will never be its factor.

Hence D.

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Re: Which of the following is NOT a factor of the product of the  [#permalink]

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New post 28 Mar 2017, 09:32
Hi Bunuel
Can you please give your explanation for this question..All the 50 multiples of 4 would be even, then how come 17 is a factor of this product?
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Re: Which of the following is NOT a factor of the product of the  [#permalink]

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New post 28 Mar 2017, 11:10
Shiv2016 wrote:
Hi Bunuel
Can you please give your explanation for this question..All the 50 multiples of 4 would be even, then how come 17 is a factor of this product?


My solution would be the same as this one: https://gmatclub.com/forum/which-of-the ... l#p1257006
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Re: Which of the following is NOT a factor of the product of the  [#permalink]

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New post 28 Mar 2017, 11:32
Shiv2016 wrote:
Hi Bunuel
Can you please give your explanation for this question..All the 50 multiples of 4 would be even, then how come 17 is a factor of this product?


Also, are you saying that even number cannot have an odd factor? It's not true. For example, 4*17 = 68 is even and is a multiple of 17.
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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: Which of the following is NOT a factor of the product of the &nbs [#permalink] 28 Mar 2017, 11:32
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