Infosys Developer interview questions

There was a puzzle round where I was given 10 puzzles to be solved in 30 minutes. I solved 9 of them and left one of them. Later on there was interview where the interviewer asked about why I didn't solve the 10th problem and some other new puzzles.

aptitude test followed by HR cum technical interview , the selection was basically done on the basics of interview as most of the students cleared written. just be confident and be truthful