The interview started with an HR round, and then there was a round with another software engineer. The HR did not give me any direction on what to prepare and mentioned there would be a coding round. I also received a CoderPad link in the meeting invite.

When the technical round started, the interviewer began asking 10th-grade probability questions, which went well. However, he never opened CoderPad and did not ask any coding problems.

It appears the HR and the interviewer did not coordinate; this was highly unprofessional. I spent most of my time preparing for coding, as suggested by HR, but it was not even asked.

When I provided time slots to HR, I gave him my availability. The HR then sent me a meeting invite for four days earlier than my given time slots and asked if I could do it or not. Why ask in the first place?

Simple math questions about probability