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If gcd (m, n) = 1 and 1 2 – 2 2 + 3 2 – 4 2 + ….. + (2021) 2 – (2022) 2 + (2023) 2 = 1012m 2 n then m 2 – n 2 is equal to

1. 240
2. 200
3. 220
4. 180

Correct answer: 240

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