(2001 korea SAT) function f (x) is f (10) = 50, f (1) = 3 are satisfied,

Sigma is sparrow beak shape chatter to solve.
={f(2)+f(3)+ ... +f(10)}- {f(1)+f(2) + ...+f(9)}
(Like this sigma assignment, chatter)
=f(10)-f(1)= 50-3=47
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