Mathematics · Permutations and Combinations
नौ अंकों 1, 2, ..., 9 में से 6 अंकों का उपयोग करके कितनी 6-अंकीय संख्याएँ बनाई जा सकती हैं यदि अंकों की पुनरावृत्ति की अनुमति नहीं है?
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