यदि \(A=\{a,b,c,d,e\}\) है, तो (A) के ऐसे कितने उपसमुच्चय हैं जिनमें कम से कम (4) तत्व हों?
If \(A=\{a,b,c,d,e\}\), how many subsets of (A) contain at least (4) elements?
Explanation opens after your attempt
B. (6)
Concept
At least (4) elements means (4) or (5) elements. The number is \(\binom{5}{4}+\binom{5}{5}=5+1=6\).
Why this answer is correct
The correct answer is B. (6). At least (4) elements means (4) or (5) elements. The number is \(\binom{5}{4}+\binom{5}{5}=5+1=6\).
Exam Tip
कम से कम (4) तत्व का अर्थ (4) या (5) तत्व है। संख्या \(\binom{5}{4}+\binom{5}{5}=5+1=6\) है।
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