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How many (4)-digit even numbers can be formed from (0,1,2,3,4,5,6) without repetition?अंकों (0,1,2,3,4,5,6) से बिना पुनरावृत्ति (4) अंकों की कितनी सम संख्याएं बनेंगी?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (360)(360)
If the unit digit is (0), there are (6\cdot5\cdot4) ways, and if it is (2,4,6), there are (3\cdot5\cdot5\cdot4) ways. The total is (120+300=420).इकाई स्थान (0) हो तो (6\cdot5\cdot4) और इकाई स्थान (2,4,6) हो तो (3\cdot5\cdot5\cdot4) तरीके हैं। कुल (120+300=420) है।
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