(20) identical balls को (5) boxes में बांटना है और exactly (2) boxes empty हों। सही count कौन-सी है?
(20) identical balls are distributed into (5) boxes and exactly (2) boxes are empty. Which count is correct?
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A. \(^{5}C_2{}^{19}C_2\)
Simple Explanation
पहले empty boxes चुनें, फिर बाकी (3) boxes में positive distribution करें। परीक्षा में exactly empty को boxes selection और positive distribution में तोड़ें। / First choose the empty boxes, then distribute positively into the remaining (3) boxes. In exams split exactly empty into box selection and positive distribution.
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