यदि \(A=\{1,2,3,4,5\}\) और \(R=\{(a,b):a+2b=7\}\) है, तो (R) में कितने क्रमित युग्म हैं?
If \(A=\{1,2,3,4,5\}\) and \(R=\{(a,b):a+2b=7\}\), how many ordered pairs are in (R)?
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Correct Answer
B. (3) युग्म(3) pairs
Concept
For (b=1,2,3), we get (a=5,3,1), so there are (3) pairs. In such counting, substitute each possible (b) and check whether (a) belongs to the set.
Why this answer is correct
The correct answer is B. (3) युग्म / (3) pairs. For (b=1,2,3), we get (a=5,3,1), so there are (3) pairs. In such counting, substitute each possible (b) and check whether (a) belongs to the set.
Exam Tip
(b=1,2,3) पर क्रमशः (a=5,3,1) मिलता है, इसलिए (3) युग्म हैं। ऐसी गिनती में हर संभव (b) रखकर (a) को समुच्चय में जांचें।
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