यदि \(A=\{a,b,c,d\}\) है तो (A) के कम से कम तीन अवयवों वाले उपसमुच्चयों की संख्या क्या है?
If \(A=\{a,b,c,d\}\) then what is the number of subsets of (A) having at least three elements?
Explanation opens after your attempt
Correct Answer
B. (5)
Concept
At least three elements means three or four elements. The count is \(\binom{4}{3}+\binom{4}{4}=4+1=5\).
Why this answer is correct
The correct answer is B. (5). At least three elements means three or four elements. The count is \(\binom{4}{3}+\binom{4}{4}=4+1=5\).
Exam Tip
कम से कम तीन अवयव का अर्थ तीन या चार अवयव हैं। संख्या \(\binom{4}{3}+\binom{4}{4}=4+1=5\) है।
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