51. Find the missing number in the following series.
1, 1, 4, 8, 9, 27, 16, ?
52. Find the missing number in the following series.
3, 5, 13, 43, 177, ?
54. Find the missing number in the following series.
10, 24, 52, ?, 220, 44, 892
55. Which of the following will not be a number of the series
1, 8, 27, 64, 125,?