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Q. Which of the following is the unit digit in (1570)^2 + (1571)^2 + (1572)^2 + (1573)^2?
Explanation by: Ravi Chauhan
Pick up the unit digit of each number and multiply them; 0^2 in (1570)^2 = 0 1^2 in (1571)^2 = 1 2^2 in (1572)^2 = 4 3^2 in (1573)^2 = 9 On adding the unit digits, we will get, 0 1 4 9 = 14 (unit digit = 4) So, on adding (1570)^2 (1571)^2 (1572)^2 (1573)^2, the unit digit will be 4.
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