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From (14) students (6) are to be selected. Exactly (2) or exactly (3) of (4) special students must be included. How many ways are there?(14) विद्यार्थियों में से (6) चुनने हैं। (4) विशेष विद्यार्थियों में से ठीक (2) या ठीक (3) शामिल हों। कितने तरीके हैं?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (2100)(2100)
The cases are (2) special and (3) special students. The total is (\binom{4}{2}\binom{10}{4}+\binom{4}{3}\binom{10}{3}=2100).मामले (2) विशेष और (3) विशेष के हैं। कुल (\binom{4}{2}\binom{10}{4}+\binom{4}{3}\binom{10}{3}=2100) है।
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