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How many arrangements of the letters of the word (NUMBER) are possible if (N) and (R) occupy the two ends?शब्द (NUMBER) के अक्षरों से ऐसे क्रम कितने बनेंगे जिनमें (N) और (R) दोनों सिरों पर हों?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (48)(48)
The two ends can be filled by (N,R) in (2!) ways and the middle (4) letters in (4!) ways. Fill fixed positions first.दो सिरों पर (N,R) को (2!) तरीकों से रखा जा सकता है और बीच के (4) अक्षर (4!) तरीकों से। स्थान निश्चित हों तो पहले उन्हें भरें।
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