1+2+3+4+5+6+7+8+9+10+11+.+10000=?

1+2+3+4+5+6+7+8+9+10+11+.+10000=?


(1+10000)×10000÷2=50005000



1+3+5+7+9+...=10000 2+4+6+8+10+...=10100
Figure out what the question marks in the two formulas should be


Arithmetic sequence
Sum = (first term + last term) × number of terms △ 2
The first is that if the last number is 2N-1, then 10000 = (1 + 2n-1) × n △ 2, n = 100 is 199
Let the last number be 2n, then 10100 = (2 + 2n) × n △ 2, n = 100, which is 200

Elden Ring Premiere

RELATED INFORMATIONS