\( 180 = 5n(n+1) → n(n+1) = 36 → n² + n − 36 = 0 → n = [-1±√145]/2 — not integer. - AMAZONAWS 📅 March 11, 2026 👤 scraface Mar 11, 2026
![\( 180 = 5n(n+1) → n(n+1) = 36 → n² + n − 36 = 0 → n = [-1±√145]/2 — not integer.](https://soloferat.biz.id/images/-180--5nn1--nn1--36--n--n--36--0--n---11452--not-integer.jpg)
