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As a precision reference, here's the 1e5/2e5 answer computed with my program. It ought to be good for 60 digits:
[thor@redwood fishers-exact-test]$ cat fetbig.dat 100000 200000 200000 100000 [thor@redwood fishers-exact-test]$ time ./fet <fetbig.dat +1.324994596496999433060120009448386330459655228210366819887079e-14760 real 21m8.445s user 20m56.788s sys 0m6.831s
It looks like your FET6 yields about 13 digits of precision for this case:
| 1.32499459649680040e-14760 +1.324994596496999433060120009448386330459655228210366819887079e-14760 |

In reply to Re^7: Algorithm for cancelling common factors between two lists of multiplicands (192.5 ms) by tmoertel
in thread Algorithm for cancelling common factors between two lists of multiplicands by BrowserUk

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