Discussion
Which of the following numbers is different from the others?
22, 32, 10, 20, 33
Answer: A
The numbers are 22, 32, 10, 20 and 33. Four of them (22, 32, 10 and 20) are even numbers, and 33 is odd, so 33 is the one different from the others. Other patterns do not single out an answer in the same way: the digit sums are 4, 5, 1, 2 and 6, and the products or differences of digits give no clear odd one out. The simplest classification is by even and odd, so the answer is 33, option A.
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