One G.M. and two A.M.s are inserted between two numbers p and q, then
G2 =2pq
G2 =(2p+q)(2p-q)
G2 =(p+q)(p-q)
G2 =(2p-q)(2q-p)
If one geometric mean G and two arithemtic means p and q be inserted between two numbers, then G2 is equal to: