In your earlier classes, you have learnt about the number line and how to represent various types of numbers on it.
You start from zero and go on walking along this number line in the positive direction. As far as your eyes can see, there are numbers, numbers and numbers!
Now suppose you start walking along the number line, and collecting some of the numbers. Get a bag ready to store them!
You might begin with picking up only natural numbers like 1, 2, 3, and so on. You know that this list goes on for ever. (Why is this true?) So, now your bag contains infinitely many natural numbers! Recall thta we donate this collection by the system N.
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