5. Arithmetic Progression If p,q, r and s are in AP then what is r - q. If 1/a, 1/b and 1/c are in AP so that b = 2ac/(a + c). (Also writes in inverse from) If p,q, r are in AP then what is (p - q)/ (q - r). If SN denotes the sum of n terms of an ap then show the value…