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Q. Which of the following is the unit digit in (1570)^2 + (1571)^2 + (1572)^2 + (1573)^2?

(A) 2
(B) 4
(C) 6
(D) 7

Correct Answer - Option(B)
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Explanation by: Admin

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.

Q. Which of the following is the unit digit in (1570)^2 + (1571)^2 + (1572)^2 + (1573)^2?

Explanation by: Admin

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