Skip to content / Đến nội dung
ThichHocToan.com

AMC10 2027 - Self-practice Set 2 Question 16

AMC10 · AMC10 2027 - Self-practice Set 2

Question 16

What is the value of
$$M=1-2\cdot2+3\cdot3-4\cdot4+5\cdot5-\cdots-2020\cdot2020+2021\cdot2021?$$
  1. $2132745$
  2. $2103471$
  3. $3106277$
  4. $2043231$
  5. $2314723$