Do you love to solve number puzzle. Can you complete the number series. Give it a try and check the answer below. Hope you will like it.

The missing number is 77
Explanation:
The series follows the below pattern
5^2 – 4=21, 6^2 – 4=32, 7^2 – 4=45, 8^2 – 4=60, 9^2 – 4=77

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