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Q.

If f(x+1)+f(x1)=2f(x)  and f(0)=0 , then f(n) , nN  is

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a

{f(1)}n

b

None

c

0

d

nf(1)

answer is A.

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Detailed Solution

f(x+1)+f(x1)=2f(x),f(0)=0

Putting x=1,f(2)+f(0)=2f(1)

f2=2f(1)

Let f(k)=kf(1)  for kn , then f(n+1)+f(n1)=2f(n)

f(n+1)=2(nf(1))f(n1)

                       =2nf(1)(n1)f(1)

                       =(n+1)f(1)

  f(n)=nf(1)nN .

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