Find the missing proportion:
3 : 9 = 2 : _
57 : _ = 19 : 38
7 : _ = 2 : 3
15 : 2 = _ : 8
0.3 : 4 = 9 : _

Astandard deck of cards contains 52 cards. one card is selected from the deck. (a) compute the probability of randomly selecting a diamond or heart. (type an integer or a decimal rounded to three decimal places as needed.) (b) compute the probability of randomly selecting a diamond or heart or club. (type an integer or a decimal rounded to three decimal places as needed.) (c) compute the probability of randomly selecting queen or club. (type an integer or a decimal rounded to three decimal places as needed.)