Hi I actually have a three part question. In the game Texas Hold'em using 52 cards

Hi I actually have a three part question. In the game Texas Hold'em using 52 cards 
a. gives you trips, contains exactly 1 card of your denomination and 2 other unpaired cards.

b. gives you "quads", 2 cards of your denomination.

c. gives you a "boat" 1 card of you denomination and 2 cards of another denomination. 
Please show how you get those answers and why.