Express 0.272727………in the form of .

12 Express 0.6666………in the form of  13 If a and b are two rational numbers, prove that a + b, a - b, ab are rational numbers. If b ≠ 0, show that a/b is also a rational number. 15 You have seen that √2 is not a rational number. Show that 2 +√2 is not a rational number. 16 Express 3.7777………. in the form of .