Recent content by Caracrist

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    Undergrad Finding 10-Digit Numbers with Divisibility Rules

    mfb, you have mistakes... 347 is not divided by 3 for example The answer is: I am not sure, but it looks like no other base has any solution.
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    Undergrad Hour & Minute Coprime: Frequency & Examples

    Answer
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    Undergrad Can You Solve This Tricky Geometric Sequence Problem?

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    Undergrad How is the Standard Deviation Affected by Gender Differences in Life Span?

    what is the men/women birth ratio?
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    High School What is the Cost of a book that costs 1$ plus half of its price?

    the Cost of a book that costs 1$ = 1$
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    What is the method used by the man and woman to complete the task?

    a man is always sitting, and a woman does it with a signal...
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    Riddle of Logic: Death by Firing Squad

    It is simple:
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    High School Is 7 the Next Number in This Sequence?

    Yes.
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    High School Is 7 the Next Number in This Sequence?

    (?) 41 12 82 53 24 94 65 36 (?) First and last in this part of the sequence are same...
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    Undergrad What is the minimum value of N in this cryptarithmetic equation?

    Answer:
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    Undergrad The Lamplighter's Manor: Light All 9 Rooms

    You have 9 lamps total. There is no reason to use one lamp more than once. The question is, which lamps to use, and which not. So there are some 9 variants in using 8 lamps, 9*8/2 = 36 variants of using 7 lamps, and so on. And of course, there is only one variant of using 9 lamps. And the...
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    I can name that physicist in 5 notes.

    20- Tesla
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    Undergrad What cometh next in the sequence?

    Answer is: (n^(n+1))*(n+2) ... next is: 2239488[/color]
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    Graduate (4-digit number)*(6-digit number) equals a factorial

    4725 * 101376 = 12!
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    High School How Much Does the Envelope Cost in the Riddle?

    Try to count it. May be it will help you to accept that correct answer.