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From (7) students, (3) students are to be selected and two special students must be selected together. How many ways are there?(7) विद्यार्थियों में से (3) विद्यार्थियों को चुनना है और दो विशेष विद्यार्थी दोनों साथ में चुने जाने चाहिए। कितने तरीके हैं?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (5)(5)
The two special students are already selected. The third student is chosen from the remaining (5) in (\binom{5}{1}=5) ways.दो विशेष विद्यार्थी पहले से चुने गए हैं। तीसरा विद्यार्थी शेष (5) में से (\binom{5}{1}=5) तरीकों से चुनेगा।
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