Teaching Bihar STET Paper 1 (माध्यमिक) Mock Test 2024 Quantitative Aptitude Number System Rational or Irrational Numbers
Which of the following statements is true?
1
A number is rational if and only if its square is rational.
2
A number n is odd if and only if n(n + 1) is even
3
An integer n is odd if and only if n2 + 2n is odd.
4
A number is irrational if and only if its square is irrational.