`\color{#00868B}{⸻}\color{#00C5CD}{⸻}\color{ #AFEEEE }{『}\color{#98F5FF }{↭} \color{#00F5FF}{E}\color{#00E5EE}{m}\color{#00C5CD}{p}\color{#40E0D0}{t}\color{#00CED1}{y}\color{#48D1CC}{B}\color{#97FFFF}{o} \color{#AEEEEE}{y} \color{#BBFFFF}{↭}\color{#AFEEEE}{』}\color{#00C5CD}{⸻}\color{#00868B}{⸻}`

`M=2/3(1+1/(2*4))(1+1/{3*5})(1+1/{4*6})...(1+1/{2018*2020})`

`M=2/3*3^2/(2*4)*4^2/(3*5)*....*2019^2/(2018*2020)`

`M=2/3*(3*3)/(2*4)*(4*4)/(3*5)*...*(2019*2019)/(2018*2020)`

`M=2/3*(3*4*5*...*2019)/(2*3*4...*2018)*(3*4*5...*2019)/(4*5*6*...2020)`

`M=2/3*2019/2*3/2020`

`M=2019/2020`