IQ test: What number should replace the question mark?
Number series or sequence test questions Riddle or IQ test Questions and Answers 2020 or 2021 (What number should replace the question mark?)
1 15 3 21 6 28 ?
Answer: 10: start at 1 and working clockwise, jump one segment adding 2, 3, 4, 5, 6, 7. That is 1+2 equals 3 and 3+3 equals 6. In the same way 6+4 equals 10
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