A series is given, with one number missing. Choose the correct alternative from the given ones that will complete the series. 1, 0.125, 1/27, 1/64, ? , 1/216
1. 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
10. How many such pairs of digits are there in the number 421579368 each of which has as many digits between them in the number as when they are arranged in ascending order?