SOLUTION: 2=6 3=12 4=20 5=30 6=42 9=?? I think the answer is 56 and my husband says 90. Who's correct?

Question 742962: 2=6
3=12
4=20
5=30
6=42
9=??
I think the answer is 56 and my husband says 90. Who's correct?
Answer by fcabanski(1391) (Show Source): You can put this solution on YOUR website!
Both of you are correct. A sequence can have multiple rules as long as the rules make sense.

56 is correct if the rule is "The left number is given, and the right number is the next even number greater than the last right number."

90 is correct if the rule is "this sequence is x on the left and y on the right (of the =) where y=x*(x+1)"

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