lucky bag

frist you have to find the frist term and the common ratio by sub how? well my submitting 1 for n in -4x(-1/2)^n-1 this will give me a1=-4x(-1/2)1-1 then identify the common ratio r=-1/2 simplify the expression a1=-4 r=-1/2 substituting -4nfor a1 and -1/2...