sentence 1: How do I know if I'm good?
 sentence 2: How do I know what I'm good at? sentence 1: Let [math]S_{n} = n^{2} + 20n + 12[/math], where [math]n[/math] is a positive integer. What is the sum of all possible values of n for which [math]S_{n}[/math] is a perfect square?
 sentence 2: Given [math]S_n = n^2 +20n + 12[/math]. What will be the sum of positive integers such that [math]S_n[/math] will be a perfect square? sentence 1: What are the biggest regrets of your life?
 sentence 2: What is your biggest regret and why? sentence 1: How do I install android kit kat on Nokia lumia 1520?
 sentence 2: Is it worth waiting for the Lumia 1525/1820, or is the Lumia 1520 good enough?
not same meaning
same meaning
same meaning
not same meaning