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Last three digits (Posted on 2011-10-19) Difficulty: 3 of 5
N is the product of all the prime numbers less than 100.

Determine the last three digits of N.

*** For an extra challenge, solve this puzzle without the aid of a computer program.

No Solution Yet Submitted by K Sengupta    
Rating: 3.0000 (2 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re: two-thirds of a solution. | Comment 4 of 9 |
(In reply to two-thirds of a solution. by Jer)

By the same logic you used for the last digit, can we not determine the third-to-last digit by considering the 'tens' values for the list of primes- some are in the 20s and some in the 50s, giving 2x5 = 10 again for this missing digit.

Making the last three digits 070.

  Posted by Matt on 2011-10-19 12:14:59
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