Numbers a, b and c are in continued proportion.

Statement 1: (a + b + c)(a - b + c) = a² + b² + c².

Statement 2: b² = ac and (a + b + c)(a - b + c) = (a + c)² - b²

1. Both the statements are true.

2. Both the statements are false.

3. Statement 1 is true, and statement 2 is false.

4. Statement 1 is false, and statement 2 is true.

If a : b = 3 : 5, find :

(10a + 3b) : (5a + 2b)

Find the duplicate ratio of $2\sqrt{2} : 3\sqrt{5}$

Find the triplicate ratio of 2a : 3b