(20%) Let x = (x1,x2.--.x,) and y = [y1, V2, Vn] be two vectors (one-dimensional arrays). The inner product of x and y is a scalar and is given by P = xyz + x3y2 + ... +xmn- a) Express the inner product P using the (summation) notation. b) Determine an explicit formula for evaluating P if x; = i and y, = 5, i =1,2,..., n. Show your work to receive full credit