अंक \( 1,2,3,4 \) और 5 से कितनी 3 अंकीय संख्याएँ बनाई जा सकती हैं, यदि (i) अंकों की पुनरावृत्ति ...

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अंक \( 1,2,3,4 \) और 5 से कितनी 3 अंकीय संख्याएँ बनाई जा सकती हैं, यदि
(i) अंकों की पुनरावृत्ति की अनुमति हो ?
(ii) अंकों की पुनरावृत्ति की अनुमति नहीं हो ?
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