Re-check: \( S_n = \fracn2(2a + (n-1)d) = \fracn2(6 + (n-1)2) = \fracn2(2n + 4) = n(n + 2) \). Set to 210: \( n^2 + 2n - 210 = 0 \). - Appfinity Technologies
Mar 01, 2026
Content is being prepared. Please check back later.
