f = {(1,-1), (2,3), (3,-2), (4,5)}. Find the value of f(1) + 2f(2) – f(4).
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f(1)=-1
f(2)=3
f(4)=5
then f(1)+2f(2)-f(4)=1+2*3-5=7-5=2.....(ans)
f(2)=3
f(4)=5
then f(1)+2f(2)-f(4)=1+2*3-5=7-5=2.....(ans)
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