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Because there is a bug
I was using a wrong factorial function.
Thanks a lot for letting us know.
Please find here attached thinBasic_Math.dll
Unzip and place into \thinBasic\Lib\ substituting your current one.
Results you should get with attached thinBasic_Math.dll version
uses "math" uses "console" ext p = Permutations(49, 6) ext c = Combinations(49, 6) printl "Permutations(49, 6):", p printl "Combinations(49, 6):", c for x as long = 1 to 50 printl "Factorial of ", x, "is", Factorial(x) Next WaitKeyPermutations(49, 6): 10068347520 Combinations(49, 6): 13983816 Factorial of 1 is 1 Factorial of 2 is 2 Factorial of 3 is 6 Factorial of 4 is 24 Factorial of 5 is 120 Factorial of 6 is 720 Factorial of 7 is 5040 Factorial of 8 is 40320 Factorial of 9 is 362880 Factorial of 10 is 3628800 Factorial of 11 is 39916800 Factorial of 12 is 479001600 Factorial of 13 is 6227020800 Factorial of 14 is 87178291200 Factorial of 15 is 1307674368000 Factorial of 16 is 20922789888000 Factorial of 17 is 355687428096000 Factorial of 18 is 6402373705728000 Factorial of 19 is 121645100408832000 Factorial of 20 is 2.43290200817664E+18 Factorial of 21 is 5.109094217170944E+19 Factorial of 22 is 1.12400072777760768E+21 Factorial of 23 is 2.58520167388849766E+22 Factorial of 24 is 6.20448401733239439E+23 Factorial of 25 is 1.5511210043330986E+25 Factorial of 26 is 4.03291461126605636E+26 Factorial of 27 is 1.08888694504183522E+28 Factorial of 28 is 3.0488834461171386E+29 Factorial of 29 is 8.84176199373970196E+30 Factorial of 30 is 2.65252859812191059E+32 Factorial of 31 is 8.22283865417792282E+33 Factorial of 32 is 2.6313083693369353E+35 Factorial of 33 is 8.6833176188118865E+36 Factorial of 34 is 2.95232799039604141E+38 Factorial of 35 is 1.03331479663861449E+40 Factorial of 36 is 3.71993326789901217E+41 Factorial of 37 is 1.3763753091226345E+43 Factorial of 38 is 5.23022617466601112E+44 Factorial of 39 is 2.03978820811974434E+46 Factorial of 40 is 8.15915283247897734E+47 Factorial of 41 is 3.34525266131638071E+49 Factorial of 42 is 1.4050061177528799E+51 Factorial of 43 is 6.04152630633738356E+52 Factorial of 44 is 2.65827157478844877E+54 Factorial of 45 is 1.19622220865480195E+56 Factorial of 46 is 5.50262215981208895E+57 Factorial of 47 is 2.58623241511168181E+59 Factorial of 48 is 1.24139155925360727E+61 Factorial of 49 is 6.08281864034267561E+62 Factorial of 50 is 3.0414093201713378E+64
Let me know if it is OK now.
Thanks
Now it's almost ok 
Sorry, My fault 