## 66. 1, 10, 7, 20, 13, 30, 19, ... choose which pair of numbers comes next?

## 67. 10, 20, 25, 35, 40, 50, 55, ... choose which pair of numbers comes next?

## 68. 42, 40, 38, 35, 33, 31, 28, ... choose which pair of numbers comes next?

## 69. 6, 10, 14, 18, 22, 26, 30, ... choose which pair of numbers comes next?

## 70. 8, 12, 9, 13, 10, 14, 11, ... choose which pair of numbers comes next?

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