Valentine's Day Clothing....CHALLENGE!

 Janet has a pink blouse, a red blouse and a white blouse.

 She has a pink skirt, a red skirt, a black skirt and a white skirt.

 How many combinations of outfits can she make?

 Valentine Card....SUPER CHALLENGE!

 Suppose there are 25 students in our class.

 Each student gives every other student in the class a card.

 How many cards are exchanged?