Problem 1.1: What is the 5^th entry in Row 12 of Pascal's Triangle? [Solution]

Problem 1.2: What is the 3^rd entry in Row 10 of Pascal's Triangle? [Solution]

Problem 1.3: What is the 7^th entry in Row 9 of Pascal's Triangle? [Solution]

Problem 1.4: What is the 15^th entry in Row 15 of Pascal's Triangle? [Solution]

Problem 1.5: If the r^th entry in Row 6 of Pascal's Triangle is 15, what are the possible values of r? [Solution]