The twin primes conjecture is one of the most important and difficult questions in mathematics. Two mathematicians have solved a parallel version of the problem for small number systems.

Check CBSE Class 9 Maths extra questions Chapter 1 - Number System (NCERT based). These questions are important for CBSE 9th Maths Annual Exam 2020-21.

Get important MCQs on Class 9 Maths Chapter 1 Number System. Answers of all questions are also provided. Download MCQs in PDF format.