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How many (3)-digit numbers can be formed from digits (1,4,7,8,9) without repetition?अंकों (1,4,7,8,9) से बिना पुनरावृत्ति कितनी (3)-अंकीय संख्याएँ बनेंगी?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (60)(60)
For three places, there are (5\times4\times3=60) ways. Without repetition, each next choice decreases.तीन स्थानों के लिए (5\times4\times3=60) तरीके हैं। बिना पुनरावृत्ति में हर अगला विकल्प कम होता है।
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