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If the function f(x) = ⎩ ⎨ ⎧ > + π − ≤ + − π 5 x , 3 x b 5 x , 1 x a is continous at x = 5, then value of a – b

1. 5 2 + π
2. 5 2 + π −
3. 5 2 − π
4. π − 5 2

Correct answer: π − 5 2

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