martes, 24 de septiembre de 2013

Math quiz of the fortnight I



12+3-4+5+67+8+9=100 

There is at least one other representation of 100 with 9 digits in the right order and math operations in between.

Can you find it?

Leave your answers in the comments below!

4 comentarios:

  1. What about 1+2+3+4+5+6+7+(8·9)? It looks like a bit easier :)

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  2. Este comentario ha sido eliminado por el autor.

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  3. Instead of showing more solutions, here I give you some "mini-challenges":
    1. Find a solution using as less operations as possible (my personal record uses 3 operations).
    2. Find solutions using operations other than addition, subtraction and product (try powers, extracting roots, factorials...).
    3. Find solutions using the decimal point.
    4. Find solutions using standard functions, such as logarithms or trigonometric functions.
    5. Find the solution involving the largest possible number (please, refrain from multiplying that number by zero).
    6. (My favorite one) Find a solution using complex numbers AND trascendental numbers. Of course, you cannot write "i" or "pi" directly, the only numbers you can use are 1,2,3,4,5,6,7,8,9 (in that order).

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  4. What about just changing the position of the numbers and signs?

    Just like this?: 123+45-67+8-9= 100

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