But $a + d = 7$ from (1) and $a + d = 5$ from (2) is a contradiction. Recheck: The second term is $a + d = 5$, and first + third is $a + (a + 2d) = 2a + 2d = 14$ → $a + d = 7$.

Sat, 18 Apr 2026 07:48:17 +0000

Content under review