prob diff b-days num people  prob overlap increase
365 1 1 0
364 0.997260274 2 0.00273973 0.00274
363 0.991795834 3 0.00820417 0.005464
362 0.983644088 4 0.01635591 0.008152
361 0.972864426 5 0.02713557 0.01078
360 0.959537516 6 0.04046248 0.013327
359 0.943764297 7 0.0562357 0.015773
358 0.925664708 8 0.07433529 0.0181
357 0.905376166 9 0.09462383 0.020289
356 0.883051822 10 0.11694818 0.022324
355 0.858858622 11 0.14114138 0.024193
354 0.832975211 12 0.16702479 0.025883
353 0.805589725 13 0.19441028 0.027385
352 0.776897488 14 0.22310251 0.028692
351 0.74709868 15 0.25290132 0.029799
350 0.716395995 16 0.28360401 0.030703
349 0.684992335 17 0.31500767 0.031404
348 0.653088582 18 0.34691142 0.031904
347 0.620881474 19 0.37911853 0.032207
346 0.588561616 20 0.41143838 0.03232
345 0.556311665 21 0.44368834 0.03225
344 0.524304692 22 0.47569531 0.032007
343 0.492702766 23 0.50729723 0.031602
342 0.461655742 24 0.53834426 0.031047
341 0.431300296 25 0.5686997 0.030355
340 0.40175918 26 0.59824082 0.029541
339 0.373140718 27 0.62685928 0.028618
338 0.345538528 28 0.65446147 0.027602
337 0.319031463 29 0.68096854 0.026507
336 0.293683757 30 0.70631624 0.025348
335 0.269545366 31 0.73045463 0.024138
334 0.246652472 32 0.75334753 0.022893
333 0.225028146 33 0.77497185 0.021624
332 0.204683135 34 0.79531686 0.020345
331 0.185616761 35 0.81438324 0.019066
330 0.167817894 36 0.83218211 0.017799 Copyright 2005, Debra K. Borkovitz.  
329 0.151265992 37 0.84873401 0.016552 You may copy or edit this material for 
328 0.135932179 38 0.86406782 0.015334 non-profit, educational use only.
327 0.121780336 39 0.87821966 0.014152
326 0.10876819 40 0.89123181 0.013012
325 0.096848389 41 0.90315161 0.01192 To Commentary   Excel File  PDF File
324 0.085969528 42 0.91403047 0.010879
323 0.076077144 43 0.92392286 0.009892 Home
322 0.067114631 44 0.93288537 0.008963
321 0.059024101 45 0.9409759 0.008091
320 0.051747157 46 0.94825284 0.007277
319 0.045225597 47 0.9547744 0.006522
318 0.039402027 48 0.96059797 0.005824
317 0.034220391 49 0.96577961 0.005182
316 0.02962642 50 0.97037358 0.004594
315 0.025568007 51 0.97443199 0.004058
314 0.021995491 52 0.97800451 0.003573
313 0.018861887 53 0.98113811 0.003134
312 0.016123037 54 0.98387696 0.002739
311 0.013737711 55 0.98626229 0.002385
310 0.011667645 56 0.98833235 0.00207
309 0.009877541 57 0.99012246 0.00179
308 0.008335021 58 0.99166498 0.001543
307 0.007010552 59 0.99298945 0.001324
306 0.005877339 60 0.99412266 0.001133
305 0.004911201 61 0.9950888 0.000966
304 0.004090425 62 0.99590957 0.000821
303 0.003395613 63 0.99660439 0.000695
302 0.002809521 64 0.99719048 0.000586
301 0.002316893 65 0.99768311 0.000493
300 0.001904295 66 0.9980957 0.000413
299 0.001559957 67 0.99844004 0.000344
298 0.001273609 68 0.99872639 0.000286
297 0.001036334 69 0.99896367 0.000237
296 0.000840424 70 0.99915958 0.000196
295 0.000679247 71 0.99932075 0.000161
294 0.000547119 72 0.99945288 0.000132
293 0.000439194 73 0.99956081 0.000108
292 0.000351356 74 0.99964864 8.78E-05
291 0.000280122 75 0.99971988 7.12E-05
290 0.000222563 76 0.99977744 5.76E-05
289 0.000176221 77 0.99982378 4.63E-05
288 0.000139045 78 0.99986095 3.72E-05
287 0.000109332 79 0.99989067 2.97E-05
286 8.56681E-05 80 0.99991433 2.37E-05
285 6.68915E-05 81 0.99993311 1.88E-05
284 5.20471E-05 82 0.99994795 1.48E-05
283 4.03543E-05 83 0.99995965 1.17E-05
282 3.11779E-05 84 0.99996882 9.18E-06
281 2.40027E-05 85 0.999976 7.18E-06
280 1.8413E-05 86 0.99998159 5.59E-06
279 1.40746E-05 87 0.99998593 4.34E-06
278 1.07198E-05 88 0.99998928 3.35E-06
277 8.13533E-06 89 0.99999186 2.58E-06
276 6.15164E-06 90 0.99999385 1.98E-06
275 4.6348E-06 91 0.99999537 1.52E-06
274 3.47927E-06 92 0.99999652 1.16E-06
273 2.60231E-06 93 0.9999974 8.77E-07
272 1.93925E-06 94 0.99999806 6.63E-07
271 1.43983E-06 95 0.99999856 4.99E-07
270 1.06508E-06 96 0.99999893 3.75E-07
269 7.84949E-07 97 0.99999922 2.8E-07
268 5.76346E-07 98 0.99999942 2.09E-07
267 4.21601E-07 99 0.99999958 1.55E-07
266 3.07249E-07 100 0.99999969 1.14E-07
265 2.23071E-07 101 0.99999978 8.42E-08
264 1.61345E-07 102 0.99999984 6.17E-08
263 1.16257E-07 103 0.99999988 4.51E-08
262 8.34499E-08 104 0.99999992 3.28E-08
261 5.96724E-08 105 0.99999994 2.38E-08
260 4.25064E-08 106 0.99999996 1.72E-08
259 3.0162E-08 107 0.99999997 1.23E-08
258 2.132E-08 108 0.99999998 8.84E-09
257 1.50116E-08 109 0.99999998 6.31E-09
256 1.05287E-08 110 0.99999999 4.48E-09
255 7.35567E-09 111 0.99999999 3.17E-09
254 5.11874E-09 112 0.99999999 2.24E-09
253 3.54806E-09 113 1 1.57E-09
252 2.44962E-09 114 1 1.1E-09
251 1.68453E-09 115 1 7.65E-10
250 1.15379E-09 116 1 5.31E-10
249 7.87106E-10 117 1 3.67E-10
248 5.348E-10 118 1 2.52E-10
247 3.61906E-10 119 1 1.73E-10
246 2.43915E-10 120 1 1.18E-10