What is 10+9+8+7+6+5+4+3+2+1? - Quora
2018年12月21日 - This works for any numerical sequence (including 10+9+8+7+6+5+4+3+2+1) so you can work out the total quickly by adding the first (call that “x”) and last (call ...
更多資訊〈Why do you see "10 9 8 7 6 5 4 3 2 1" on the copyright page of ...〉