Question 1190184
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To add to the answer @greenestamps provided, consider the example sequence 
2,4,...


One guess at the next term could be 6
2,4,6,...
and it appears that we're listing the multiples of 2 (i.e. add 2 to each term to get the next)


Or another guess could be the next term is instead 8
2,4,8,...
Showing what appears to be powers of 2 (i.e. multiply each term by 2 to get the next)


Unfortunately there is ambiguity so there's no way to tell for sure. 
In fact, the next number could be anything if the rules aren't defined well enough. 
You'll have to ask your teacher for further clarification.


This is why "find the next term" type of problems are a bit of a pain. 
Especially when your teacher simply states the list of numbers without any further worded instruction. 
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