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Find the formula (Posted on 20240410) 

f(a,b) is defined by the following table:
f(2,3)=10,
f(3,7)=28,
f(4,5)=33,
f(5,8)=61,
f(6,7)=73,
f(7,8)= ???
Fill in the last value of f(a,b), and derive its formula.
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