1 −3( 7 3 n− 7 2 ) July 8, 2019 16 32 64 128 1 7 3 left ( dfrac 3 7 n - dfrac 2 7 right 1 7 3 3 7 n 2 7 Frac 1 7 3 left ( dfrac 3 7 n - dfrac 2 7 right 1/7 −3( 7 3 n− 7 2 )
