Quantitative Aptitude Ques 805

Question: The digit in unit’s place of the number $ {{(1570)}^{2}}+{{(1571)}^{2}}+{{(1572)}^{2}}+{{(1573)}^{2}} $ is

Options:

A) 4

B) 2

C) 1

D) 3

Show Answer

Answer:

Correct Answer: A

Solution:

  • Unit digit of $ {{(1570)}^{2}}=0 $ Unit digit of $ {{(1571)}^{2}}=1 $ Unit digit of $ {{(1572)}^{2}}=4 $ Unit digit of $ {{(1573)}^{2}}=9 $ Required unit digit = Unit digit of $ (0+1+4+9)=14 $

$ \therefore $ Unit digit = 4

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