14:I[5014,["/_next/static/chunks/11d1gk4m2o846.js","/_next/static/chunks/14mrh2-p_w84d.js","/_next/static/chunks/40y9lkvta2o_p.js"],"default"] 15:I[38392,["/_next/static/chunks/11d1gk4m2o846.js","/_next/static/chunks/14mrh2-p_w84d.js","/_next/static/chunks/40y9lkvta2o_p.js"],"PracticeCard"] 17:I[70570,["/_next/static/chunks/11d1gk4m2o846.js","/_next/static/chunks/14mrh2-p_w84d.js","/_next/static/chunks/40y9lkvta2o_p.js"],"ExamAppearanceBadge"] 16:T65b,

Correct Sentence: If he had followed the design code, the error would not have occurred.

- প্রদত্ত বাক্যটি 3rd conditional এর উদাহরণ। তাই If যুক্ত Clause টি past perfect হওয়ায় পরবর্তী Clause এ would not have এর পর verb এর past participle হয়েছে।

• Third conditional-এর নিয়মানুযায়ী:
- If clause (শর্তযুক্ত অংশে)-এ যদি (had + V3) হয়, তবে পরবর্তী clause -এ would/could/might + have + V3 + extension হয়।
- Structure: If + Past Perfect (had +V3) + Subject + would/could/might + have + verb-এর past participle.
- Negative অর্থ প্রকাশ করলে would/could/might + not হয়।

Other Options:
ক) If he would have followed the design code, the error would not occur.
- ভুল (সবচেয়ে সাধারণ ভুল)।
- "If" clause-এ would have followed ব্যবহার করা যায় না।

খ) If he follows the design code, the error would not have occurred.
- ভুল (mixed conditional-এর ভুল ব্যবহার)।
- "follows" হলো present simple (first conditional-এর মতো)।

ঘ) If he followed the design code, the error will not have occurred.
- ভুল (tense mismatch).
- "followed" হলো past simple (second conditional-এর মতো present/future unreal).