NDA Math Limit, Continuity and Differentiability

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For the next three (03) items that follow:
Let f(x) be a function in 1≤x<∞ by
f(x)={
2−xfor1≤x≤2
3x−x2forx>2
[NDA I 2014]
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Question : 100 of 105
 
Marks: +1, -0
What is the differentiable coefficient of f(x) at x = 3?
[NDA I 2014]
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