We know some educated people are rich and no rich person is unhappy. Since some doctors are educated (subset), some doctors could be among those rich people, making them not unhappy.

All flowers are plants, all plants require sunlight. Since some things requiring sunlight are expensive, it's possible that some flowers (being things requiring sunlight) are expensive.

All innovations are risky, but we only know some risky ventures fail. We cannot establish that the innovations which are risky are necessarily among those risky ventures that fail.

All programmers are logical thinkers. Since no illogical person is successful, programmers (being logical) are not excluded from being successful. They may be successful.

Phoenix is a mythical creature, and no mythical creature is real. Therefore, Phoenix is not real.

All mathematicians are analytical. Some analytical people lack creativity. Therefore, some mathematicians (being analytical) may lack creativity.

All athletes are disciplined. Some disciplined people are not wealthy. This means some athletes (being disciplined) could be among those not wealthy. So some athletes may not be wealthy.

All employees are trained. Some trained people are not productive. Therefore, some employees (being trained) may be among those not productive, so some may not be productive.

From 'All programmers are tech-savvy' and 'Some tech-savvy people are introverts', we cannot deduce that some programmers are introverts (they could be different tech-savvy people). II is clearly false as introverts are not necessarily programmers.

A is 3rd from left. B is 2 positions right of A, so B is at 5th position. C is at one end (either 1st or 8th). If C is 1st, people between = 3 (positions 2,3,4). If C is 8th, people between = 2 (positions 6,7). Most likely C at 1st = 3 people between.