Title: वैकल्पिक

Text: Suppose the sets A1, ... An all have size k and suppose further that no element is contained in more than k sets. Then there exists k systems of distinct representatives such that for any i the k representatives of Ai are distinct and thus together form the set Ai. प्रत्येक पराग्राफले परीक्षण हुनेछ।

Save test: यदि तपाईं यो टाइपिङ परीक्षणलाई साझा गर्न चाहानुहुन्छ भने यो प्रयोग गर्नुहोस् (केवल प्रमाणीकृत प्रयोगकर्ताहरूको लागि)।