Respuesta :
v= volume number
v; v+1
v(v+1) = 420
v^2 + v - 420 = 0
(v-20)(v+21)
v1 = 20 ; v2 = - 21 (void)
20; 21 are the two volume numbers
v; v+1
v(v+1) = 420
v^2 + v - 420 = 0
(v-20)(v+21)
v1 = 20 ; v2 = - 21 (void)
20; 21 are the two volume numbers