\(यदि (Y={x:x\in \mathbb{N},,x\) is prime and x+2 is also prime\(,,x<20}), तो (Y) क्या है\)?
\(If (Y={x:x\in \mathbb{N},,x\) is prime and x+2 is also prime\(,,x<20}), what is (Y)\)?
Correct answer and explanation
A. \(Y=\{3,5,11,17\}\)
Concept
(20) से छोटे अभाज्य (2,3,5,7,11,13,17,19) हैं। / Primes less than (20) are (2,3,5,7,11,13,17,19).
Why this answer is correct
जिनके साथ (x+2) भी अभाज्य है, वे (3,5,11,17) हैं। / Values for which (x+2) is also prime are (3,5,11,17).
Exam Tip
प्रत्येक मान पर दूसरी शर्त अलग से जांचें। / Check the second condition separately for every candidate.
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