यदि \(A=\{a,b,c,d,e,f\}\), तो (\mathcal{P}(A)) के कितने तत्वों में ठीक तीन तत्व होंगे और (a) नहीं होगा?
If \(A=\{a,b,c,d,e,f\}\), how many elements of (\mathcal{P}(A)) have exactly three elements and do not contain (a)?
Explanation opens after your attempt
A. (10)
Concept
After excluding (a), (5) elements remain. Choosing exactly (3) of them gives \(\binom{5}{3}=10\) ways.
Why this answer is correct
The correct answer is A. (10). After excluding (a), (5) elements remain. Choosing exactly (3) of them gives \(\binom{5}{3}=10\) ways.
Exam Tip
(a) को हटाने पर (5) तत्व बचते हैं। उनमें से ठीक (3) चुनने के \(\binom{5}{3}=10\) तरीके हैं।
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