Four Puzzles

You’re playing bridge. Each of four players is dealt 13 cards. You and your partner find that between you you hold all 13 cards of one suit. Is this more or less likely than that the two of you hold no cards of one suit?
As he left a restaurant, a man gave the cashier a card bearing the number 102004180. The cashier charged him nothing. Why?
How can you position a marble on the floor of an empty room so that I can’t hit it with a baseball?
Thrice what number is twice that number?

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The two events are equivalent — if two players lack all cards of a given suit, then the other two players hold all of them. 102004180 means “I ought to owe nothing for I ate nothing.” Put it in the corner. Zero.