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How many (5)-digit odd numbers can be formed from (0,1,2,3,4,5,6,7,8) without repetition?अंकों (0,1,2,3,4,5,6,7,8) से बिना पुनरावृत्ति (5) अंकों की कितनी विषम संख्याएं बनेंगी?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (6720)(6720)
There are (4) choices (1,3,5,7) for the last place, and the first place cannot be (0). The total is (4\cdot7\cdot{}^{7}P_3=5880).अंतिम स्थान पर (1,3,5,7) के (4) विकल्प हैं और पहला स्थान (0) नहीं हो सकता। कुल (4\cdot7\cdot{}^{7}P_3=5880) है।
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