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Q: What number should come next in the following sequence 18211720161915?

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A single number, such as 364758 does not describe a sequence, nor a series.

18

3 Each term is divided by 3 to produce the following term.

Consecutive terms in the sequence are being divided by -2. Therefore, -1 / -2 = 1/2 or 0.5.

a four number sequence is the easiest and longest number sequence to remember.

44. You're adding 11 then 9 each time !

What should be the next number in the following series? 100 96 104 88 120 56

The sequence indicates that one number is added to the previous number to find the value of the next number. Example 1 (+0) - 1 (+1) - 2 (+1) - 3 (+2) - 5 (+3) - 8 (+5) - 13. The next number in the sequence would be 21 (13 + 8).

The next number is 25 but there are the sequence is infinite so there can be no end to the sequence.

13

Whatever you like. One single number, as you have in the question, does not define a sequence.

It appears the sequence is of numbers in descending order followied by the number 8: 9(8)8(8)7(8)6(?), therefore, if the sequence is true, the number six should be followed by the number 8.

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