13
The next letter should be N, following the sequence E I L N.
18
3 Each term is divided by 3 to produce the following term.
fug
A single number, such as 2481020, cannot define a sequence.
jj
-2
36864
10
A single number, such as 364758 does not describe a sequence, nor a series.
Consecutive terms in the sequence are being divided by -2. Therefore, -1 / -2 = 1/2 or 0.5.
What should be the next number in the following series? 100 96 104 88 120 56