LIC AAO Prelims practice question
Using the digits 1, 3, 5 and 7, how many 4-digit numbers can be formed if repetition of digits is allowed?
From a LIC AAO Prelims Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (B) 256
There are 4 digits available (1, 3, 5 and 7), and since repetition is allowed, each of the 4 places can be filled in 4 ways. So the total count = 44 = 256.
हिंदी में प्रश्न
अंकों 1, 3, 5 और 7 का प्रयोग करके, यदि अंकों की पुनरावृत्ति की अनुमति है, तो कितनी 4-अंकीय संख्याएँ बनाई जा सकती हैं?
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सही उत्तर: (B) 256
कुल 4 अंक उपलब्ध हैं (1, 3, 5 और 7), और चूँकि पुनरावृत्ति की अनुमति है, इसलिए 4 स्थानों में से प्रत्येक को 4 तरीकों से भरा जा सकता है। अतः कुल संख्या = 44 = 256।
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