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[" 4."quad " Leta "=min{x^(2)+2x+3,x in ...

[" 4."quad " Leta "=min{x^(2)+2x+3,x in R)&b=lim_(theta rarr0)(1-cos theta)/(theta^(2))" .The "],[" value of "sum_(r=0)^(n)a^(r)b^(a-r)" is "],[[" (A) "(2^(n+1)-1)/(3*2^(n))," (B) "(2^(n+1)+1)/(3*2^(n))],[" (C) "(4^(n+1)-1)/(3.2^(n))," (D) None of these "]]

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