Problem 3. Provide short answers to the following questions: a. Write an example of a valid argument. b. Write an example of a sound argument. c. What is the advantage of a sound argument compared with a valid argument? d. Using the truth table for implication, show when an argument is valid but not sound.

How many ways are there to select 3 cards from the following deck of 50 cards such the all of them share the same letter? AO A1 A2 A3 A4 A5 A6 A7 A8 A9 BO B1 B2 B3 B4 B5 B6 B7 B8 B9 CO C1 C2 C3 C4 C5 C6 C7 C8 C9 DO D1 D2 D3 D4 D5 D6 D7 D8 D9 EO E1 E2 E3 E4 E5 E6 E7 E8 E9 O C(10, 1) × C(5, 3) Oc(5, 1) x 10 O (10, 1) x53 O C(10, 1) × P(5, 3) O C(5, 1) × P(10, 3) О С 5, 1) х О(10, 3)

The set of odd integers between 88 and 100 (inclusive) is: Write the set with the roster notation.

Refer to the previous question. How many pointers (parent-to-child and sibling-to-sibling) do you chase to find all keys between 4 and 7? 3 5   6   2 4