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In arrangements of the letters of (NUMBER), how many have (N) and (R) at the two ends?शब्द (NUMBER) के अक्षरों की व्यवस्थाओं में (N) और (R) सिरों पर हों, ऐसी कितनी व्यवस्थाएं हैं?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (48)(48)
(N) and (R) can occupy the ends in (2!) ways, and the remaining (4) letters in (4!) ways. With end restrictions, fill the ends first.(N) और (R) सिरों पर (2!) तरीकों से होंगे और शेष (4) अक्षर (4!) तरीकों से। सिरों पर शर्त हो तो पहले सिरों को भरें।
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