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If you could do it, it'll be much appreciated. x^n(1+1/x)^n(1+x)^2=(1+x)^n+2 I obtained that part, but the problem lies in the second part (n) +2( n ) + ( n ) = (n+2) (r)-----(r-1)----(r-2)----( r ) Yea, didn't really know how to do that short hand notation for nCk :uhoh: Whoops editted

Ethanol Methylated Spirits Propanol Sorry if this was posted before, I've searched using the search function so don't go nuts. Thanks~ :)

I know conventional current is the flow of positive charges and real current is the flow of electrons. But when a question just asks for current, is current the flow of positive charges to the negative terminal?

haha how do you find the range of a given function for example f(x)=1 / root( x^2-1) hahah sorry again, i don't know if there is a root on the keyboard