[tex]\huge\mathcal{\fcolorbox{aqua}{azure}{\red{Question:-}}}[/tex]
Let f: R → R be such that for all
x ∈ R, (21 + x + 21 – x), f(x) and (3x + 3-x) are in A.P., then the minimum value of f(x) is :
(a) 0
(b) 4
(c) 3
(d) 2
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