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The missing number is 18
The missing number is 21. The reason is because you are adding seven and then subtracting one. You start out with 3 (3 + 7 = 10) then (10 - 1 = 9) then (9 + 7 = 16) and so on.
thirty-two increase difference by two each time 4 + 4 = 8 8 + 6 = 14 14 + 8 = 22 22 + 10 = 32
22 + 8 - 10 = 20 Therefore, the number he is thinking of is 22.