Length (7) strings (5) symbols से बनती हैं और exactly (3) distinct symbols use हों। सही form कौन-सी है?
Length (7) strings are formed from (5) symbols and exactly (3) distinct symbols are used. Which form is correct?
Correct answer and explanation
A. \(^{5}C_3\left(3^7-3\cdot2^7+3\right)\)
Simple Explanation
पहले (3) symbols चुनें, फिर (7) positions पर onto strings बनाएं। परीक्षा में exactly distinct symbols के लिए choose set plus onto count करें। / First choose (3) symbols, then form onto strings on (7) positions. In exams use choose set plus onto count for exactly distinct symbols.
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