Answer:
71-80: 4
81-90: 6
Explanation:
71-80: 74, 78, 77, 71 (4 numbers)
81-90: 90, 90, 89, 86, 83, 83 (6 numbers)
Answer: 4, 6
4 given numbers within 71-80
6 given numbers within 81-90
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