ધારો કે S એ 5 ધટકો ધરાવતો એક ગણ છે તથા \(P ( S )\) એ S નો ઘાતગણ (Power set) દર્શાવે છે. ધારોકે \(A \cap B=\varnothing\) થાય તે રીતે ગણ \(P ( S ) \times P ( S )\) માંથી ક્રમયુક્ત જોડ \(( A , B )\) પસંદ કરવાની ઘટના \(E\) છે. જો ઘટના \(E\) ની સંભાવના \(\frac{3^p}{2^q}\) જ્યાં \(p, q \in N\) હોય, તો \(p+q\) = ___ .

A 10
B 12
C 15
D 18

Verified Solution

Answer & Solution

Correct Answer

(C) 15

Step-by-step Solution

Detailed explanation

\(S=\{a, b, c, d, e\} \) \(P ( S )\) contains 32 elements both set A and set B are subsets of \(P ( S )\) Every element has 4 choices \(\text {Favourable cases }=3^5\) \(\text {Total cases }=4^5\) \(P =\frac{3^5}{4^5}=\frac{3^5}{2^{10}}\) \(m=5, n =10\) \(m+ n =15\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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વર્ગ	\(0-4\)	\(4-8\)	\(8-12\)	\(12-16\)	\(16-20\)
આવ્રુતિ	\(3\)	\(9\)	\(10\)	\(8\)	\(6\)