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No paper, just in head...
Some easy facts:
1000*1000=(999+1)*(999+1) 999*1000=999,000 1000-999=1
The hard mental math:
999*(1000-1)=999,000-999=998,001
Ok, now it's obvious: (998,001-1)/998
(998,001-1)/998
No paper, just in head...
Some easy facts:
1000*1000=(999+1)*(999+1) 999*1000=999,000 1000-999=1The hard mental math:
999*(1000-1)=999,000-999=998,001Ok, now it's obvious:
(998,001-1)/998