Q.

If fx is a polynomial satisfying fxf1/x=fx+f1/x and f3=28 then f4 is equal to

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a

63

b

65

c

17

d

none of these

answer is B.

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Detailed Solution

fx=xn+1or    f3=3n+1=28or    3n=27∴     n=3or    f4=43+1=65
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