Question 5
There are $15$ white, $16$ yellow and $12$ brown chopsticks mixed together. With eyes closed, how many must you take to guarantee one pair that is not white and another pair that is not yellow?
Editorial working convention: A pair consists of two sticks of the same colour; the two pairs must use four distinct sticks.
Editorial working convention: A pair consists of two sticks of the same colour; the two pairs must use four distinct sticks.