Saturday, 10 February 2018

Twenty children are queueing for ice cream that is sold at R5 per cone. Ten of the children have a R5 coin, the others want to pay with R10 bill.At the beginning , the ice cream man doesn't have any change. How many possible arrangements of the twenty kids in a queue are there so that the ice cream man will never run out of change
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pigeonhole principal

Prove that any sequence of nm + 1 distinct real numbers either contains an increasing subsequence of length n + 1 or a decreasing subsequen...

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  • pigeonhole principal
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