1. **State the problem:** We have 2000 people attending the first webinar. 2. **Given data:** - 65% of first webinar attendees attended the second webinar. - 44% of those who attended both first and second webinars attended the third webinar. - 31% of those who attended the first but NOT the second webinar attended the third webinar. 3. **Find:** Number of people who attended both the first and third webinars but did NOT attend the second webinar. 4. **Calculate attendees of the second webinar:** $$2000 \times 0.65 = 1300$$ 5. **Calculate attendees who attended first but NOT second webinar:** $$2000 - 1300 = 700$$ 6. **Calculate attendees who attended first and second webinars and then third webinar:** $$1300 \times 0.44 = 572$$ (not directly needed for the final answer but useful for understanding) 7. **Calculate attendees who attended first but NOT second webinar and attended third webinar:** $$700 \times 0.31 = 217$$ 8. **Answer:** The number of people who attended both the first and third webinars but did NOT attend the second webinar is **217**.