Sir aap questions no 2 me last ke division me (60 +30÷50×20 )me 50,20 ka zero cut kar sakhte the or 5,30 ko divide kar sakhte or 6×2 =12 zyada essy se aata .
Sir please make 9th std science 11.Reflection of Light ke chapter may apne page no. 125 Cartesian sign convention topic nhi liya sir My humble request sir please take this Chapter