phil1882

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About phil1882

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  1. phil1882 added an answer to a question Folding a paper into a sphere   

    assuming you also had scissors...
     
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  2. phil1882 added an answer to a question Triangle with a given perimeter   

    no clue on this one, you can divide a single line segment to any measurement, but showing any point m to construct a triangle of any parameter? much much harder i think.
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  3. phil1882 added an answer to a question numbers by the book   

    alright sorry, i tried to make it such that there was only 1 solution but looks like i failed. thanks for finding all 3.
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  4. phil1882 added an answer to a question if a,b,c, and d are natural numbers revisited.   

    yeap, or more specifically a power of 3.
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  5. phil1882 added an answer to a question if a,b,c, and d are natural numbers revisited.   

    i'm not going to list how to make each weight, however

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  6. phil1882 added an answer to a question numbers by the book   

    this solution doesn't work, as tim and fred both end in 2.
    the numbers 1-5 should appear once in each digit place between men, as hint #2 tries to explain.
     
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  7. phil1882 added a question in New Logic/Math Puzzles   

    numbers by the book
    Five men, one of which is Greg each selected 5 unique 3 digit numbers from a hat. given the clues, can you tell what the numbers are and the men who selected them?
    1. Each digit for the number chosen by each man is unique. (that is, if the number begins with 1, 1 wont appear anywhere else in the number.)
    2. Each digit for each place between men is unique. (that is, if a number begins with 1, no other number begins with 1.)
    3. Only the digits 1-5 are used.
    4. Andy has the smallest number, and it's evenly divisible by 5.
    5. Both Bob's and Fred's numbers are evenly divisible by 3.
    6. Bob's number is smaller than Fred's.
    7. Tim's number is evenly divisible by 2, and a prime.
    8. Tim's number is greater than Bob's.
    9. Fred's middle most number is prime.
    10. Bob's middle and last number are odd.
    11. the middle digit of Tim's number is twice as big as Andy's.
     
    good luck and enjoy!
    • 6 replies
    • 213 views
  8. phil1882 added an answer to a question Half as old as my brother   

    i was thinking it would be false if both were born on he same day, but even here it would be true, because they can't be born at exactly the same time.
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  9. phil1882 added a question in New Logic/Math Puzzles   

    some 5 minute brain teasers
    1. if all borks are grogs, and all grogs are snorts, are all snorts borks?
    2. prove that GCD(A,B) = GCD(A+B,A) = GCD(A+B,B)
    3. how much water, approximately, would you need to cover all land on earth in 3 feet of snow?
    4. whats the shortest distance between any two points on a globe? A) straight line B) curved line
    5. and just to be silly: what's the speed of dark?
     
     
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  10. phil1882 added an answer to a question Relatively prime   

    if you really wanna see something bizarre, the Riemann zeta function tells us that the sequence 1 +2 +3 +4 +5 .... = -1/12.
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  11. phil1882 added an answer to a question Relatively prime   

    the equation
    1/1^2 +1/2^2 +1/3^2 ... is well known to be pi^2/6, and is equivalent to 1/(1-1/2^2) *1/(1-1/3^2) *1/(1-1/5^2) ...
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  12. phil1882 added an answer to a question Relatively prime   

    i'd take the bet.



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