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

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