The digit at unit’s place of the number (1570)2 + (1571)2

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The digit at unit’s place of the number (1570)² + (1571)² + (1572)² + (1573)² is :

1. 4
2. 1
3. 2
4. 3

Correct Option: A

Unit’s digit in (1570)² = 0
Unit’s digit in (1571)² = 1
Unit’s digit in (1572)² = 4
Unit’s digit in (1573)² = 9
∴ Required unit’s digit
= Unit’s digit in (0 +1 + 4 + 9) = 4