[" 5.If "x in R," the numbers "5^(1+x)+5...

[" 5.If "x in R," the numbers "5^(1+x)+5^(1-x),a/2,25^(x)+25^(-x)],[" form an A.P.then 'a' must lie in the interval; "],[[" (A) "[1,5]," (B) "[2,5]," (C) "[5,12]," (D) "[12,oo)]]

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