Any number that you choose can be the next number. It is easy to find a rule based on a polynomial of order 6 such that the first six numbers are as listed in the question followed by the chosen next number. There are also non-polynomial solutions. Short of reading the mind of the person who posed the question, there is no way of determining which of the infinitely many solutions is the "correct" one.
The simplest rule, based on a polynomial of order 5 isU(n) = (-129*n^5 + 2325*n^4 - 15885*n^3 + 50715*n^2 - 73706*n + 38680)/20 for n = 1, 2, 3, ...and, accordingly, the next number is 1328.
What should be the next number in the following series? 100 96 104 88 120 56
184
In a series of numbers, there are rhythms that change. In the order of 100, 140, and 40, the number that would come next would be 80 because 40 should be added.
184
184
The next number in the sequence 100,96,104,88,120,56 is 184.The pattern is minus 4, plus 8, minus 16, plus 32, minus 64, plus 128
49
The series is decreasing by a factor of 10 each time, moving from 100 to 10 to 1 to 0 to 1 to 0.1 to 0.01. The next number in the series would be 0.001, as it continues to decrease by a factor of 10 each time.
49
The next whole number greater than 100 is 101.
The series is decreasing by consecutive perfect squares starting from 16^2 (256) and decreasing by 2^2 each time. Therefore, the next number in the series would be 4^2, which is 16.
If the sequence is determined by 100 - 70 = 30, then the next number is 10.