Problem Solving :: RE: product of prime #’s

January 28, 2010 — 4GMAT - GMAT Classes, Math eBooks

Author: ajith Posted: Thu Jan 28, 2010 5:47 am (GMT -8) rahul.s 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 2, 3, 5, 7, 11, 13, 17, and 19 5*19 = 95 close to 10^2 17*2*3 = 102 close to 10^2 7*11*13 = 1001 close to 10^3 Hence 10^( 2+2+3) = 10^7 _________________ Always borrow money from a pessimist, he doesn’t expect to be paid back.

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Problem Solving :: RE: product of prime #’s

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Problem Solving :: product of prime #’s

January 28, 2010 — 4GMAT - GMAT Classes, Math eBooks

Author: rahul.s Subject: product of prime #’s Posted: Thu Jan 28, 2010 5:30 am (GMT -8) 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 OA: C Source: OG OG’s explanation: The prime numbers less than 20 are 2, 3, 5, 7, 11, 13, 17, and 19. Th eir product is 9,699,690 (arrived at as follows: 2*3*5*7*11*13*17*19 = 9,699,690)

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Problem Solving :: product of prime #’s

Posted in 1001-close, Area, GMAT, Interview, OG, Problem Solving, RC, Subject, eir-product, make-sure, more-detail, powers, rahul-s-wrote, source, the-following, usable-method. Comments Off

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