Let ƒ : R $$ \to $$ R be such that for all x $$ \in $$ R (21+x + 21–x), ƒ(x) and (3x + 3–x) are in A.P., then the minimum value of ƒ(x) is
JEE · Math · previous-year question
- A.2
- B.0
- C.3
- D.4
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