PRove that in general that if P,Q,R and S are four colliear points such that Q divides PR internally in the same ratio as S divides PR externally, then R divides QS internally in the same ratio as P dividies QS externally.
I know what I'm supposed to do, but I don't arrive at the answer. Can someone post a solution?
I know what I'm supposed to do, but I don't arrive at the answer. Can someone post a solution?