If f (x) has isolated point of disconti...

If `f (x) ` has isolated point of discontinuity at `x=a` such that `|f (x)` is continuous at `x=a` then :

`lim _(xtoa) f(x)` doesn not exist

`lim _(xtoa) f (x) + f(a) =0`

`f (a) =0`

None of these

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VIKAS GUPTA (BLACK BOOK) ENGLISH-CONTINUITY, DIFFERENTIABILITY AND DIFFERENTIATION-EXERCISE (SUBJECTIVE TYPE PROBLEMS)

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