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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(2): two-thirds of a solution. | Comment 5 of 9 |
(In reply to re: two-thirds of a solution. by Matt)

It doesnt work this way.  Consider multiplying 2 two-digit numbers.  The digit in the tens place is the sum of two products plus any carries.

That third-from-the-end zero is the sum of many sub-products, not just the product of 2 and 5.

  Posted by Jer on 2011-10-19 13:57:49

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