The sequence is formed by subtracting 89 at the first step and then reducing this figure by 9 at each successive step.
298 - 89 = 209
209 - 80 = 129
129 - 71 = 58
58 - 62 = -4
-4 - 53 = -57........this is the next number in the series.
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The difference between one number and the next in the sequence is decreasing by 9 each time. Therefore, the difference between -4 and the next number will be equal to 62 - 9 = 53. The next number is therefore equal to -4 - 53 = -57.
202
The next number in the progression is 43 - the sequence continues to increase by ascending odd numbers.
10 thought it was 108
59 is the next number in this series.