Mathematics · Permutations and Combinations
अंकों के समुच्चय {1, 2, 3, 4, 5, 6} पर विचार कीजिए। यदि अंकों की पुनरावृत्ति की अनुमति है, तो इस समुच्चय से 4-अंकों वाली कितनी सम संख्याएँ बनाई जा सकती हैं?
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