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Question No. 16
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Let(X, d) be any metrie space and xo e X Then for r > 0, the set Sp(x0) is called open
sphere, If radius r centered at xo
C (10)={xe X/d(x, xg) = 0
Os (xa) = {xe X/d(x, xo) = 0
OS (xo)={xe X/d(x, xo)<r
OS ()= xe X/d(x, Ko)>r
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