Mathematics · Permutations and Combinations
मान लीजिए Tn एक n-भुजाओं वाले नियमित बहुभुज के शीर्षों को मिलाने से बनने वाले सभी संभावित त्रिभुजों की संख्या है। यदि Tn+1 - Tn = 21 है, तो n का मान है:
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