1. Joined
    26 Apr '03
    Moves
    26771
    02 Aug '11 05:082 edits
    Originally posted by kes29
    I get 8 with 2018!
    Correctamundo!
  2. Joined
    18 Jan '07
    Moves
    12352
    02 Aug '11 10:33
    Originally posted by JS357
    Inquiring minds want to know how S Blue got it and how kes knew it was right.
    I considered the factors involved in getting a ten, then wrote a computer program to check that my intuition was correct. (Always check that your intuition is correct - testing proves more than proof does!)

    Richard
  3. Joined
    18 Jan '07
    Moves
    12352
    02 Aug '11 12:382 edits
    Originally posted by iamatiger
    For bonus points:
    1) Give the first year that was a sum of 3 numbers that multiply together to end in 8 zeros.

    2) Give the first year that will be a sum of 3 numbers that multiply together to end in 9 zeros.
    That's a good combination. I suspect that the solution to the first one will be the obvious, but that this won't work for the second, which will need another distribution - but I haven't checked those yet.

    Reveal Hidden Content
    That is - the first one should be 625, 625, 256; but the second ought not to be 625, 3125, 512. Perhaps it\'s 625, 625, 2560. If so, I have a hunch about a more general solution.


    Richard
  4. Joined
    26 Dec '09
    Moves
    69901
    03 Aug '11 14:33
    Originally posted by iamatiger
    For bonus points:
    1) Give the first year that was a sum of 3 numbers that multiply together to end in 8 zeros.

    2) Give the first year that will be a sum of 3 numbers that multiply together to end in 9 zeros.
    Reveal Hidden Content
    1) Probably 1400 = 400 + 500 + 500; 2) Too easy...
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