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

Ravi Chauhan • 9.28K Points
Tutor III Math

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

(A) 2

(B) 4

(D) 7

Correct Answer - Option(B)

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.

You must be Logged in to update hint/solution

Previous MCQ Next MCQ

Discusssion

Related MCQs on Math

Q. If the angle of elevation of a tower from a distance of 100 metres from its foot is 60?, the height ...

Q. A team of 8 persons joins in a shooting competition. The best marksman scored 85 points. If he had s...

Q. It was Thursday on 12th January 2006. What day of the week it will be on January 12th 2007 ?

Q. Area of a square natural lake is 50 sq. kms. A driver wishing to cross the lake diagonally, will hav...

Q. The average marks of a class increased by 0.5 when a student mistakenly wrote 54 instead of 24. Find...

Q. Two numbers are in the ratio 3:4, When 3 is subtracted from both the numbers, the ratio becomes 2:3....

Q. The area of the triangle whose vertices are given by the coordinates (1, 2), (-4, -3) and (4, 1) is

Q. If three numbers are added in pairs the sum equals to 10, 19 and 21. Find the numbers

Q. A man went downstream for 28 km in a motor boat and immediately returned. It took the man twice as l...

Q. A hall is 15 m long and 12 m broad. If the sum of the areas of the floor and the ceiling is equal to...

Learn All Math MCQs

Download our easy to use, user friendly Android App from Play Store. And learn MCQs with one click.