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JEE Mains · Maths · STD 11 - 6. permutation and combination

माना \(A\) तथा \(B\) दो समुच्चय हैं जिनमें क्रमशः चार तथा दो अवयव हैं, तो समुच्चय \(A \times B\) के उन उपसमुच्चयों की संख्या, जिनमें प्रत्येक में कम से कम तीन अवयव हैं, है

  1. A \(510\)
  2. B \(219\)
  3. C \(256\)
  4. D \(275\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(219\)

Step-by-step Solution

Detailed explanation

\(A=\{x, y\}\) \(B=\{a, b, c, d\}\) \(a \times B\) having \(2 \times 4=8\) elements Total substance of \(A \times B\) is \(2^{8}=256\) \(\therefore\) Total no. of subsets of \(A \times B\) having \(3\) or more elements \(=256 - 1 \) null set \(+8\) single ton set…
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