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[" Let "f" be a real valued function sat...

[" Let "f" be a real valued function satisfying "],[f(x+y)=f(x)" .If "(y)" for all "x,y in R" and "f(1)=2." If "],[sum_(k=1)^(n)f(a+k)=16(2^(n)-1)," then "a=?],[[" (1) "3," (2) "4],[" (3) "2," (4) None "]]

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