At the end of his Bachelor's degree in civil engineering, a student applies for the following three jobs: A: Draftsman in municipal engineering, B: Technician in building, and C: Technician in geotechnics. He estimates that his chances of getting an offer for job A are 50%, for job B, 40% and for job C, 20%. On the other hand, his chances of getting an offer for jobs A and B are 10%; for A and C, 4%, for B and C, 3%; and for A, B and C, 1%. 1. What is the probability that this student will not get any offers? 2. What is the probability that this student will get an offer for A but not for B or C?