If x = y + 2 then x3 - y3 - z3 is
If a+ 1/b = 1 and b+1/c = 1, then the value of c+1/a is
If x2+1/x2=98 (x>0), then the value of x3+1/x3 is
A solid sphere of radius 3 cm is melted to form a hollow right circular cylindrical tube of length 4 cm and external radius 5 cm. The thickness of the tube is