Mathematics · Group Theory
चार अवयवों वाले एक समुच्चय के क्रमचयों (permutations) के संगत सममित समूह (symmetric group) S4 पर विचार करें। S4 में कितने गैर-तत्समक स्व-व्युत्क्रम (non-identity self-inverse, अर्थात कोटि 2 वाले) अवयव हैं?
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