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Matching Birthdays

What are the odds that two or more persons in a group of 25 people will have a birthday on the same day?

REPEAT 1000
GENERATE 30 1,365 A          

generate 30 "birthdays", each represented by a number from 1-365

MULTIPLES A >= 2 J

how many duplicates, triplicates, quadruplicates, etc.?

  SCORE J Z

keep score

END
COUNT Z >= 1 K

how often were one or more birthdays replicated?

DIVIDE K 1000 KK
PRINT Z KK
HISTOGRAM Z