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# If n is the product of the first 10 prime numbers, which of the follow

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Current Student
Joined: 12 Aug 2015
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If n is the product of the first 10 prime numbers, which of the follow [#permalink]

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13 Sep 2015, 00:02
3
00:00

Difficulty:

25% (medium)

Question Stats:

71% (00:43) correct 29% (00:38) wrong based on 143 sessions

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If n is the product of the first 10 prime numbers, which of the following is an integer?

I. $$\frac{n}{7}$$

II. $$\frac{n}{4}$$

III. $$\frac{n}{143}$$

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

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Re: If n is the product of the first 10 prime numbers, which of the follow [#permalink]

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13 Sep 2015, 01:46
1
The product of first 10 prime numbers is: 2*3*5*7*11*13*17*19*23*29 = n
I) n/7 is an integer --> Yes (It is a part of the product)
II) n/4 is an integer --> No (2 is present only once in the product, not twice)
III) n/143 is an integer --> Yes (Both 11 and 13 are a part of the product)

Ans: C
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Re: If n is the product of the first 10 prime numbers, which of the follow [#permalink]

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15 Sep 2017, 09:41
If n is the product of the first 10 prime numbers, which of the following is an integer?

I. $$\frac{n}{7}$$

II. $$\frac{n}{4}$$

III. $$\frac{n}{143}$$

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

Looking at each Roman numeral, we see that II is n/2^2 and III is n/(11 x 13).

Since 7 is included in the product of the first 10 prime numbers as well as 11 x 13, while 2^2 is not, only 7 and 143 will divide n.

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Re: If n is the product of the first 10 prime numbers, which of the follow   [#permalink] 15 Sep 2017, 09:41
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