IBPS RRB Office Assistant (Multipurpose) Prelims practice question
How many 4-digit (odd) numbers can be formed using the digits 1, 2, 4, 5, 6, 8, 9 without repetition?
From a IBPS RRB Office Assistant (Multipurpose) Prelims Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (A) 360
Fix the last (units) digit as odd first: 3 choices. The remaining 3 places are filled from the other 6 digits without repetition: 3 × ᴾ(6,3) = 360.
हिंदी में प्रश्न
अंकों 1, 2, 4, 5, 6, 8, 9 का प्रयोग करके बिना पुनरावृत्ति के कितनी 4-अंकीय (विषम) संख्याएँ बनाई जा सकती हैं?
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (A) 360
पहले अंतिम (इकाई) अंक को विषम तय करें: 3 विकल्प। शेष 3 स्थान अन्य 6 अंकों में से बिना दोहराव के भरे जाते हैं: 3 × ᴾ(6,3) = 360।
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