Bridge (cf. footnote 1). For k 1, 2, 3, 4 let N be the event that North has at least k aces. Let S, E, W be the analogous events for South, East, West. Discuss the number x of aces in West's possession in the events

(a) W,

(e) NSEW,

(b) NS,

(f) N3W 1,

(c) NSE, (g) (N S)E.

(d) W2 W 3,

(b) S3 W = 0,

(e) (NS) W3 = 0,

(c) NSEW = 0,

(f) W NSE. =