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GMAT OG 2018 Diagnostic Test Q15

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Intern
Joined: 01 Oct 2017
Posts: 8
GMAT OG 2018 Diagnostic Test Q15  [#permalink]

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22 Oct 2017, 17:32
The product of all the prime numbers less than 20 is closest to which of the following powers of 10?

(A) 10^9
(B) 10^8
(C) 10^7
(D) 10^6
(E) 10^5

Is there a way to guess the correct one without actually multiplying all the primes under 20 and rounding then off?

When nothing goes right, remember that a²+b²=c²

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Manager
Joined: 22 May 2015
Posts: 106
Re: GMAT OG 2018 Diagnostic Test Q15  [#permalink]

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22 Oct 2017, 18:25
Is it C?

Sent from my Moto G (5) Plus using GMAT Club Forum mobile app
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Consistency is the Key

Math Expert
Joined: 02 Sep 2009
Posts: 47977
Re: GMAT OG 2018 Diagnostic Test Q15  [#permalink]

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22 Oct 2017, 20:52
nileshm wrote:
The product of all the prime numbers less than 20 is closest to which of the following powers of 10?

(A) 10^9
(B) 10^8
(C) 10^7
(D) 10^6
(E) 10^5

Is there a way to guess the correct one without actually multiplying all the primes under 20 and rounding then off?

When nothing goes right, remember that a²+b²=c²

Discussed here: the-product-of-all-the-prime-numbers-less-than-20-is-closest-135192.html

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

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Re: GMAT OG 2018 Diagnostic Test Q15 &nbs [#permalink] 22 Oct 2017, 20:52
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