its actually very simple... v r not gonna let u t code! but v wud help u to get it urselves...
Let the three numbers b a,b and c... thn the arithmetic mean is (a+b+c)/3, geometric mean is cube root of (a+b+c) and harmonic mean is (ab+bc+ac)/3*a*b*c... finish, tats a simple program! u wud get it done with in a matter of seconds!