NCERT Solutions for Class 10 Maths Chapter 1
Important NCERT Questions
Real Numbers
NCERT Books for Session 2022-2023
CBSE Board and UP Board Others state Board
EXERCISE 1.4
Page No:18
Questions No:3
The following real numbers have decimal expansions as given below. In each case, decide whether they are rational or not. If they are rational, and of the form, p / q what can you say about the prime factors of q? (i) 43.123456789 (ii) 0.120120012000120000. . .
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(i) 43.123456789
Since this number has a terminating decimal expansion, it is a rational number of the form and q is of the form 2^m x 5^n
i.e., the prime factors of q will be either 2 or 5 or both.
(ii) 0.120120012000120000…..
The decimal expansion is neither terminating nor recurring. Therefore, the given number is an irrational number.
Explanation ЁЯСЗ
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