#class 10th math प्रश्नावली 3.3 Q 1(ii) @प्रतिस्थापन बिधि//parathisthapanbidhi#ncert #Class 10th math chapter #क्लास 10th प्रश्नावली 3.3 #bihar board exam 2025#all questions ncert maths book solution by munna sir