(n) distinct symbols से length (r) strings बनती हैं और exactly (s) distinct symbols use हों। सही count कौन-सा है?
Length (r) strings are formed from (n) distinct symbols and exactly (s) distinct symbols are used. Which count is correct?
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A. (^{n}C_s s! S(r,s))
Simple Explanation
पहले (s) symbols चुनें, फिर (r) positions को उन (s) symbols पर onto map करें। परीक्षा में exactly distinct symbols में onto idea उपयोग करें। / First choose (s) symbols, then map the (r) positions onto those (s) symbols. In exams use the onto idea for exactly distinct symbols.
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