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[lim(h rarr0)(f(a+2h)-f(a-h))/(h)=18," t...

[lim_(h rarr0)(f(a+2h)-f(a-h))/(h)=18," then "],[[(A)f(a)=6," (B) "f(x)" is continuous at "x=a],[" (C) "lim_(x rarr a)(x)" exists "," (D) none of these "]]

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