Ye concept hota hai , koi maine nhi bnaya hai , ncert me khi nhi hai but ncert ke solution me khi likha hai , khi bhi module me nhi hai , kuch books me ho bhi skta hai maine M.Sc ke ek book me padha tha , or usse baki relation explain krna easy hota hai isliye padhata tha , question exactly aa gya to aacha lga , khusi huaa apne hard-work pe , to aapko bataya , maine aisa nhi bola sirf maine hi padhaya hai , 4-5% teacher ne padhaya bhi hoga , Isko kai log negative le rhe hai , Koi bat nhi kuch bhi kro , kuch log to honge hi ,🙏