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Let f(x)={1+(2x)/a ,0lt=x<1 and ax ,...

Let `f(x)={1+(2x)/a ,0lt=x<1 and ax ,1lt=x<2` If `lim_(x->1)f(x)` exists ,then ` a` is (a)` 1` (b) `-1` (c) `2` (d) `-2`

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