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How many (5)-digit numbers divisible by (8) can be formed from digits (0,1,2,3,4,5,6,7,8,9) without repetition?अंकों (0,1,2,3,4,5,6,7,8,9) से बिना पुनरावृत्ति कितनी (5)-अंकीय संख्याएं (8) से विभाज्य बनेंगी?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (3360)(3360)
Divisibility by (8) is decided by the last (3) digits and the first digit cannot be (0). In such questions, count valid last (3)-digit endings first.(8) से विभाज्यता अंतिम (3) अंकों से तय होती है और पहले अंक में (0) नहीं आ सकता। ऐसे प्रश्नों में अंतिम (3) अंकों के मान्य क्रम पहले गिनें।
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