How did Ramanujan solve the STRANDpuzzle?

https://www.youtube.com/watch?v=V2BybLCmUzs
Channel: Mathologer
Times watched: 5
Watch Times
Date Before
2025-03-22 16:56 1 year, 7 months
2023-12-20 14:23 2 years, 10 months
2023-07-09 19:46 3 years, 4 months
2020-12-26 14:14 5 years, 10 months
2020-10-27 13:31 6 years