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The probability of landing on the pink sector is calculated by finding the number of pink sectors and dividing by the total number of sectors. In this case, there are 5 pink sectors out of 20 total sectors, so the probability is 5/20 or 1/4.
If we take 20 spins, we can expect it to land on pink approximately 20 * 1/4 = 5 times, according to theoretical probability.