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If the function g(x) = ⎪ ⎩ ⎪ ⎨ ⎧ ≤ < + ≤ ≤ + 5 x 3 , 2 mx 3 x 0 , 1 x k is differentiable, then the value of k + m is :

1. 2
2. 5 16
3. 3 10
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Correct answer: 2

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