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CBSE Class 9MathematicsNumber System

Two friends Avvye and Shubham were planting trees along the boundary of their society. While doing this, Avvye said that they could only plant the number of trees which would be a natural number or a positive integer. Shubham agreed with his thought. (i) Are both of them correct? (ii) Define natural number, integers, rational and irrational number. (iii) What values are depicted from their activity?

Step-by-step solution

(i) Yes, both are correct as natural number is the set of whole positive integers. (ii) Natural number: A natural number is the number that is used for counting, i.e. starting from 1 onwards. They are the whole positive integers. Integers: It is the whole number that can be positive, negative or zero. Z = ......–4, –3, –2, –1, 0 , 1, 2, 3, ...... Rational number: Any number that can be written in the form is called rational number, where p and q are integers and q ≠ 0. Irrational number:

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