by Vijay Ramanujan
Last Updated September 20, 2018 18:20 PM

f is defined on domain [0, 1]. If x = 1/n where n is a positive integer, then f(x) = 1. Otherwise, f(x) = 0. Can I check, how many values of x in the interval [0,1] exist such that f is continuous at x?

Yes, you can. Hint: There are three types of points: $x=0, x=\frac1n$ and all other points. How many are there of each type? At which of those is $f$ continuous?

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