is rd sharma illustration examples necessary to solve ????

Hello dear

Maths is all about concepts and practice. The more you practice the more you will become efficient in problem solving. So it's depends upon you , you can solve it or leave them.

I would suggest you to solve these because it will built your concepts and help you to go through the concepts and type of questions related to that particular topic.

You can go beyond rd sharma for some brainstorming and tricky questions  , which you will find in these books : ADas gupta, Cengage , Arihant by amit m aggarwal, etc.

So good luck