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Let f:[0,1]→R is a function such that f(x)={a,b,if x∈Q∩[0,1]if x∈Qc∩[0,1], where Q is set of rational numbers. For any partition P of [0,1], if a<b then U(f,P)−L(f,P)=

(A) a−b.

(B) b−a.

(C) (a−b)2.

(D) 1.
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