If 2 @ 3 = 25 and 3 @ 4 = 49, what is 4 @ 5?

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Accepted Answer

1. Note that $25=5^2$ and $49=7^2$.  
2. See that $5=2+3$ and $7=3+4$.  
3. So the rule is: $a\ @\ b=(a+b)^2$.  
4. For $4\ @\ 5$ we get $(4+5)^2=9^2=81$.  
FINAL_ANSWER: a

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