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Let f(x) :R->R,f(x)={(2x+alpha^2,xge2),(...

Let `f(x) :R->R,f(x)={(2x+alpha^2,xge2),((alpha x)/2+10,x lt 2))` If `f(x)` is onto function then `alpha` belongs to (A) `[1,4]` (B) `[-2,3]` (C) `[0,3]` (D) `[2,5]`

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