3.1/7, 14, 1/21, 42, 1/36, 72, 1/48, ()  A.96 B.144  C.288 D.76

热心网友

1/7 * 14 =21/21 * 42=21/36 * 72=21/48 *(?)=2 = (?)=96 So,it`s A

热心网友

a