>>I plan to post the answers to these on monday.
>>
>>
>>1) Can the following expression be simplified?
>>
>>

>>(x-a)(x-b)(x-c)...(x-z)
>>

>>
>>Only basic algebra is required.
>
>It could be converted to following:
>
>X^26 - a*X^25 + a*b*X^24 - ....... - a*b*c*...*y*X^1 + a*b*c*...*y*z
>

>That seems does not look like a simpified version, because this version is worse for programming (more operations and more risk of overflow).
>

He-he :) X is a letter too :)

>
>>
>>
>>In the following problems, each letter represents a digit. Same letter, same digit. Different letters mean different digits.
>>
>>
>>2.
>>

>>ABCD
>>x  4
>>----
>>DCBA
>>

>>
>>
>>3.
>>

>> SEND
>>+MORE
>>-----
>>MONEY
>>

>>
>>
>>Regards, Hilmar.