f(5)=35
f(6)=48
f(7) =63
f(9)= ?
P.S. This is a number analogy question.
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Although it's possible to come up with many satisfactory relations, the simplest one I can find with its answer within those given is f ( n ) = n × ( n + 2 ) So the answer is 9 × 1 1 = 9 9 .