生日悖论计算

http://efgh.com/math/birthday.htm

50%机会介于第22人和23人之间

remaining	base	1-prob.	n	prob.
		1	1	0
364	365	0.99726	2	0.00274
363	365	0.991796	3	0.008204
362	365	0.983644	4	0.016356
361	365	0.972864	5	0.027136
360	365	0.959538	6	0.040462
359	365	0.943764	7	0.056236
358	365	0.925665	8	0.074335
357	365	0.905376	9	0.094624
356	365	0.883052	10	0.116948
355	365	0.858859	11	0.141141
354	365	0.832975	12	0.167025
353	365	0.80559	13	0.19441
352	365	0.776897	14	0.223103
351	365	0.747099	15	0.252901
350	365	0.716396	16	0.283604
349	365	0.684992	17	0.315008
348	365	0.653089	18	0.346911
347	365	0.620881	19	0.379119
346	365	0.588562	20	0.411438
345	365	0.556312	21	0.443688
344	365	0.524305	22	0.475695
343	365	0.492703	23	0.507297