Skip to content / Đến nội dung
ThichHocToan.com

SMO 2017 Open Round 1 Question 3

SMO · SMO 2017 Open Round 1

Question 3

If $$T=\frac11+\frac1{1+2}+\frac1{1+2+3}+\frac1{1+2+3+4}+\cdots+\frac1{1+2+3+4+\cdots+2016},$$ find $2017\times T$.