यदि \(A=\{1,2,3\}\) और \(B=\{1,2,3,4\}\), तो \(A\times B\) में (b-a) एक सम धनात्मक संख्या हो, ऐसे युग्म कितने हैं?
If \(A=\{1,2,3\}\) and \(B=\{1,2,3,4\}\), how many pairs in \(A\times B\) make (b-a) a positive even number?
Explanation opens after your attempt
Correct Answer
C. (3)
Concept
We need (b=a+2), so the valid pairs are ((1,3)) and ((2,4)), only (2) pairs. Convert the condition into an equation and then check available elements.
Why this answer is correct
The correct answer is C. (3). We need (b=a+2), so the valid pairs are ((1,3)) and ((2,4)), only (2) pairs. Convert the condition into an equation and then check available elements.
Exam Tip
(b=a+2) चाहिए, इसलिए युग्म ((1,3)), ((2,4)) और ((1,? )) नहीं, केवल (2) युग्म हैं। शर्त को पहले समीकरण में बदलें और उपलब्ध तत्व जांचें।
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