hey guys i have this problem been going at it for like an hour still can't find out

it goes like this

A polynomial W(x) has a remainder of 2 after division by (x-1) and a remainder of 1 after division by (x-2). What then is its remainder after division by (x-2)(x-1)? and the method of thinkign ofc.

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3.14159... Pi.
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3? r2 + r1 = r3??

I'm not sure i suck at math

Nope, that's wrong.

I've seen it at university but forgot it. Quite curious now to know the answer.