SOLUTION: I have been trying to figure out what the missing number is in 81 _ 91? I have tried all different types of methods and the answers I'm not to sure of. Please help

SOLUTION: I have been trying to figure out what the missing number is in 81 _ 91? I have tried all different types of methods and the answers I'm not to sure of. Please help

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Question 835770: I have been trying to figure out what the missing number is in 81 _ 91? I have tried all different types of methods and the answers I'm not to sure of. Please help
Answer by richard1234(7193) (Show Source): You can put this solution on YOUR website!
If it's a three term sequence, I'm not sure if there is enough info to determine a definite pattern. If the sequence is arithmetic, the middle number is 86.
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