यदि \(A=\{1,2,3,4\}\) और \(B=\{1,2,3,4\}\), तो \(A\times B\) में (a) और (b) दोनों अभाज्य होने वाले युग्मों की संख्या कितनी है?
If \(A=\{1,2,3,4\}\) and \(B=\{1,2,3,4\}\), how many pairs in \(A\times B\) have both (a) and (b) prime?
Explanation opens after your attempt
B. (4)
Concept
The prime elements in each set are (2,3). Hence \(2\cdot2=4\) pairs are formed.
Why this answer is correct
The correct answer is B. (4). The prime elements in each set are (2,3). Hence \(2\cdot2=4\) pairs are formed.
Exam Tip
प्रत्येक समुच्चय में अभाज्य तत्व (2,3) हैं। इसलिए \(2\cdot2=4\) युग्म बनेंगे।
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