10 X = RND(-TI)

20 T = 0 : REM Times where gold was picked first
30 G = 0 : REM Times where gold was also picked second


40 FOR X = 0 TO 100000
50 D1 = INT(RND(1)*3)+1 : REM Which bag?
70 IF D1 = 1 THEN 100 : REM Chose first bag
80 IF D1 = 2 THEN 200 : REM Chose second bag
90 GOTO 250           : REM Chose third bag
100  T = T + 1
110  G = G + 1        : REM First bag, both are gold gold
120  GOTO 250

200 D2 = INT(RND(1)*2)+1 : REM Pick ball
210 IF D2 = 2 THEN 250   : REM Took a silver ball
220 T = T + 1            : REM Took a gold ball
250 NEXT

300 PRINT G/T