Substituting $a_1 = 13$, $d = 7$, and $n = 15$:

Sun, 03 May 2026 19:13:37 +0000

**Substituting $a_1 = 13$, $d = 7$, and $n = 15$: A Data-Driven Approach Gaining Curiosity in 2025 In today’s fast-evolving digital landscape, patterns like substituting variables in sequences are