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80 10 70 15 60 What number should come next

This question belongs to Competitive Reasoning Number Series Completion
Number Series Completion
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80, 10, 70, 15, 60, ... What number should come next?

Answer & Solution
Correct Answer: Option A
This is an alternating addition and subtraction series. In the first pattern, 10 is subtracted from each number to arrive at the next. In the second, 5 is added to each number to arrive at the next.
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