Q: Look carefully for the pattern, and then choose which pair of numbers comes next. 3 8 13 18 23 28 33
Solution: In this simple addition series, each number is 5 greater than the previous number.
Q: 84 78 72 66 60 54 48
Solution: In this simple subtraction series, each number is 6 less than the previous number.
Q: 20 20 17 17 14 14 11
Solution: This is a simple subtraction with repetition series. It begins with 20, which is repeated, then 3 is subtracted, resulting in 17, which is repeated, and so on.
Q: 61 57 50 61 43 36 61
Solution: This is an alternating repetition series, in which a random number, 61, is interpolated as every third number into an otherwise simple subtraction series. Starting with the second number, 57, each number (except 61) is 7 less than the previous number.
Q: 9 12 11 14 13 16 15
Solution: This is a simple alternating addition and subtraction series. First, 3 is added, then 1 is subtracted, then 3 is added, 1 subtracted, and so on.
Q: 4 8 22 12 16 22 20 24
Solution: This is an alternating repetition series, with a random number, 22, interpolated as every third number into an otherwise simple addition series. In the addition series, 4 is added to each number to arrive at the next number.
Q: 40 40 31 31 22 22 13
Solution: This is a subtraction series with repetition. Each number repeats itself and then decreases by 9.
Q: 1 10 7 20 13 30 19
Solution: Here, every other number follows a different pattern. In the first series, 6 is added to each number to arrive at the next. In the second series, 10 is added to each number to arrive at the next.
Q: 10 20 25 35 40 50 55
Solution: This is an alternating addition series, in which 10 is added, then 5, then 10, and so on.
Q: Look carefully for the pattern, and then choose which pair of numbers comes next. 42 40 38 35 33 31 28
Solution: This is an alternating subtraction series in which 2 is subtracted twice, then 3 is subtracted once, then 2 is subtracted twice, and so on.
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