Find the value of a+b+c+d If a,b,c,d are positive numbers of algebraic sequence and a,b,c+4,d+13 are positive numbers of a geometric sequence
If abcde=1 (where a,b,c,d and e are all positive real numbers) then what is the minimum value of a+b+c+d+e?
Give positive numbers a, b and c are such that ab + bc + ca + abc = 4, What is the value of 1/a+2 + 1/b+2 + 1/c+2 = ?