30
61, 57, 50, 61, 43, 36, 61, ... choose which pair of numbers comes next?
- A29, 61
- B27, 20
- C31, 61
- D22, 15
- E29, 22
Correct answer: E
Discussion 1
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CCommunity
29, 22
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.
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.