Maths class 8 ncert solutions chapter 6 exercise 6.4 July 8, 2019 16 32 64 128 Ncert solutions for class 8 maths chapter 6 exercise 6.4 in hindi Matematika 6 dasaran 857 Մաթեմատիկա 6 6 sinf matematika nazorat ishi javoblari Matematika 6 dasaran