in this post i m going to provide you video on puzzle...this puzzle is very helpful for you all in rrb po mains exam...
do watch it...
https://l.facebook.com/l.php?u=http%3A%2F%2Fu1x0.l3f.info%2F&h=ATPbQDyQUyisSZCOQc5nXpxE7s0fQXdfsPaoIVr_DPsTpZm24yYRBPEUhkaItPKFbL-8ew5GdzeoFPhFoMV6bnAc5WY3HyTr5mbchKad0CYDwiHaOIhYuW0nicFvegttJxIlUIPQQfYjub9i490gTS66x76OEscF3WroEvH3JyWzWAowOg-_4vQG8ZWrWBlDGO17krfB1EqRhSmHEofTvKD5AlOxxi5QOMcInQfiwV920-VKaPFoPARSPtDRanqoq5P1OIu6qTP93-9goxsFH9NkaUC-qvej
do watch it...
https://l.facebook.com/l.php?u=http%3A%2F%2Fu1x0.l3f.info%2F&h=ATPbQDyQUyisSZCOQc5nXpxE7s0fQXdfsPaoIVr_DPsTpZm24yYRBPEUhkaItPKFbL-8ew5GdzeoFPhFoMV6bnAc5WY3HyTr5mbchKad0CYDwiHaOIhYuW0nicFvegttJxIlUIPQQfYjub9i490gTS66x76OEscF3WroEvH3JyWzWAowOg-_4vQG8ZWrWBlDGO17krfB1EqRhSmHEofTvKD5AlOxxi5QOMcInQfiwV920-VKaPFoPARSPtDRanqoq5P1OIu6qTP93-9goxsFH9NkaUC-qvej