\(यदि (U={x:x\in\mathbb{N},1\le x\le 20}) और (A={x:x\) अभाज्य संख्या है\(}) है, तो (A^c) में कितने तत्व होंगे\)?
\(If (U={x:x\in\mathbb{N},1\le x\le 20}) and (A={x:x\) is a prime number\(}), how many elements are in (A^c)\)?
Explanation opens after your attempt
A. (12)
Concept
There are (8) primes from (1) to (20), so (n\(A^c\)=20-8=12). Do not treat (1) as prime.
Why this answer is correct
The correct answer is A. (12). There are (8) primes from (1) to (20), so (n\(A^c\)=20-8=12). Do not treat (1) as prime.
Exam Tip
(1) से (20) तक (8) अभाज्य संख्याएं हैं, इसलिए (n\(A^c\)=20-8=12)। (1) को अभाज्य न मानें।
Login to save your score, XP, coins and progress.
