WBJEE 2025 Math Paper

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Question : 14 of 75

Marks: +1, -0

A function f:ℝ⟶ℝ, satisfies f(‌

x+y

3

)=‌

f(x)+f(y)+f(0)

3

for all x,y∈ℝ. If the function ' f′ is differentiable at x=0, then f is

linear
quadratic
cubic
biquadratic

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