Problem : What is the 5th entry in Row 12 of Pascal's Triangle?

C(12, 4) = 495.

Problem : What is the 3rd entry in Row 10 of Pascal's Triangle?

C(10, 2) = 45.

Problem : What is the 7th entry in Row 9 of Pascal's Triangle?

C(9, 6) = 84.

Problem : What is the 15th entry in Row 15 of Pascal's Triangle?

C(15, 14) = 15.

Problem : If the rth entry in Row 6 of Pascal's Triangle is 15, what are the possible values of r?

r = 3 or r = 5.