R Ram Sharma 🎓 Coach ⭐ 193.88K Points 📊 Reasoning Q. Complete the series.... 15, 21, 57, ?, 221 (A) 96 (B) 126 (C) 108 (D) 121 👁️ Show Answer 🔗 Share ⚡Menu ✅ Correct Answer: (D) 121 You must be Logged in to update hint/solution 💬 Discussion 💬 Comment