यदि \(A=\{1,2,3,4\}\) और \(B=\{1,2\}\) हैं, तो \(A\times B\) में कितने युग्म ((x,y)) ऐसे हैं कि (x-y=2)?

If \(A=\{1,2,3,4\}\) and \(B=\{1,2\}\), how many pairs ((x,y)) in \(A\times B\) satisfy (x-y=2)?

Explanation opens after your attempt
Correct Answer

A. (2)

Step 1

Concept

The valid pairs are ((3,1)) and ((4,2)). A quick method is to choose (y) and find (x=y+2).

Step 2

Why this answer is correct

The correct answer is A. (2). The valid pairs are ((3,1)) and ((4,2)). A quick method is to choose (y) and find (x=y+2).

Step 3

Exam Tip

सही युग्म ((3,1)) और ((4,2)) हैं। (y) चुनकर (x=y+2) निकालना तेज तरीका है।

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Mathematics Answer, Explanation and Revision Hints

यदि \(A=\{1,2,3,4\}\) और \(B=\{1,2\}\) हैं, तो \(A\times B\) में कितने युग्म ((x,y)) ऐसे हैं कि (x-y=2)? / If \(A=\{1,2,3,4\}\) and \(B=\{1,2\}\), how many pairs ((x,y)) in \(A\times B\) satisfy (x-y=2)?

Correct Answer: A. (2). Explanation: सही युग्म ((3,1)) और ((4,2)) हैं। (y) चुनकर (x=y+2) निकालना तेज तरीका है। / The valid pairs are ((3,1)) and ((4,2)). A quick method is to choose (y) and find (x=y+2).

Which concept should I revise for this Mathematics MCQ?

The valid pairs are ((3,1)) and ((4,2)). A quick method is to choose (y) and find (x=y+2).

What exam hint can help solve this Mathematics question?

सही युग्म ((3,1)) और ((4,2)) हैं। (y) चुनकर (x=y+2) निकालना तेज तरीका है।