Suppose you declare an array double list[] = {1, 3.4, 5.5, 3.5}. &list[1] is same as ________.

In the hexadecimal system, 21 is expressed as ____.

A. 1F B. F C. 15 D. F1

One card is selected at random from a deck of cards. Find the probability of selecting a five or a four.

A.
B.
C.
D.
E.