2. A series is given, with one number missing. Choose the correct alternative from the given ones that will complete the series. 6, 18, 54, ? , 486, 1458
7. A series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series. XIIIII, IXIIII, IIXIII, IIIXII,IIIIXI, ?