यदि \(f:A\to B\) में \(A=\{m,n\}\) और \(B=\{r,s,t\}\) है तो किसी फलन में (m) के लिए कितने विकल्प हैं?
If \(f:A\to B\), \(A=\{m,n\}\), and \(B=\{r,s,t\}\), how many choices are there for (m) in a function?
Explanation opens after your attempt
A. (3)
Concept
The image of (m) can be any one of the (3) elements of (B). In counting, each domain element gets as many choices as the codomain size.
Why this answer is correct
The correct answer is A. (3). The image of (m) can be any one of the (3) elements of (B). In counting, each domain element gets as many choices as the codomain size.
Exam Tip
(m) का प्रतिबिंब (B) के किसी भी (3) तत्वों में से एक हो सकता है। गिनती में हर प्रांत तत्व के लिए सहप्रांत की संख्या विकल्प देती है।
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