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Problems based on Numbers Test 6

Question : 9 of 40

Marks: +1, -0

(1,570)^2 + (1,571)^2 + (1,572)^2 + (1,573)^2

is:

Solution:

Concept:

To find the unit digit of a sum of squares, only the unit digits of the given numbers matter.

Explanation:

The unit digits of

(1570), (1571), (1572), (1573)

are

0,1,2,3

Square each unit digit:

0^2=0

1^2=1

2^2=4

3^2=9

Add them:

0+1+4+9=14

The unit digit of

14

4

Answer:

The digit in the unit’s place is

4

, so the correct option is A.

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