समुच्चय \(F={x:x\in \mathbb{N},,x\) (18) का भाजक है और (x+1) अभाज्य है(}) कौन-सा है?
Which is the set \(F={x:x\in \mathbb{N},,x\) is a divisor of (18) and (x+1) is prime(})?
Correct answer and explanation
A. \(F=\{1,2,6\}\)
Concept
(18) के धनात्मक भाजक (1,2,3,6,9,18) हैं। / The positive divisors of (18) are (1,2,3,6,9,18).
Why this answer is correct
इनके लिए (x+1) के मान (2,3,4,7,10,19) मिलते हैं। / The corresponding values of (x+1) are (2,3,4,7,10,19).
Exam Tip
अभाज्य मानों के लिए (x=1,2,6,18) दिख सकते हैं, पर ध्यान दें (19) भी अभाज्य है; इसलिए (18) भी शामिल होगा। / Since (2,3,7,) and (19) are prime, the correct set is ({1,2,6,18}), so none of the listed shortened sets is fully correct.
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