Titlebook: Combinatorial techniques; Sharad S. Sane Book 2013 Hindustan Book Agency (India) 2013

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Pigeonhole principle,ho weighs at the most 41 kg. In fact, if there is one student with weight larger than 41 kg., then there must be some other student whose weight is less than 41 kg. There are four suits (spades, hearts, diamonds and clubs in the hierarchy) in a pack of 52 cards where every bridge player receives 13