SOLUTION: what is the possible answer to the "?" in the series? the question is 50, 70, ? ,90, ?, ? thanks

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Question 471082: what is the possible answer to the "?" in the series?
the question is 50, 70, ? ,90, ?, ?
thanks
Answer by richard1234(7193) About Me  (Show Source):
You can put this solution on YOUR website!
That is a sequence, not a series (series is the sum of the terms in a sequence). Also, if the question marks represent the same number, then there is no definite sequence. There could possibly be a sequence {50, 70, 80, 90, 95, 97.5} which is similar to a geometric sequence.