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[" If "f" be decreasing continuous funct...

[" If "f" be decreasing continuous function satisfying "f(x+y)=f(x)+f(y)-f(x)f(y)AA x,y in R" ; "],[f'(0)=-1," then "int_(0)^(1)f(x)dx" is "],[[" (A) "1," (B) "1-e],[" (C) "2-e," (D) none of these "]]

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