यदि \(A=\{1,2,3,4,5\}\) है तो (A) के (2) अवयवों वाले ऐसे उपसमुच्चयों की संख्या क्या है जिनमें (5) न हो?
If \(A=\{1,2,3,4,5\}\) then how many two element subsets of (A) do not contain (5)?
Explanation opens after your attempt
B. (6)
Concept
Exclude (5) and choose (2) elements from (1,2,3,4). The count is \(\binom{4}{2}=6\).
Why this answer is correct
The correct answer is B. (6). Exclude (5) and choose (2) elements from (1,2,3,4). The count is \(\binom{4}{2}=6\).
Exam Tip
(5) को हटाकर (1,2,3,4) में से (2) अवयव चुनने हैं। संख्या \(\binom{4}{2}=6\) है।
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