Question

1/1+ 1/(1+2)+1/(1+2+3)..... 2020 terms =m/n where m and n are coprime natural numbers then m/(n-1) is equal to
1
2
3
none of these​

Answer 1

2

Step-by-step explanation:

sn=2(n/n-1)

s2020=2(2020/2020+1)

=4040/2021

therefore,

m= 4040

n= 2021