Multiple Choice Questions on Consider the following statements 1 Unit digit in 17174 is 7 2 Difference of of the squares of any t........... for CDS Exam Preparation

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Multiple Choice Questions

Consider the following statements 1 Unit digit in 17174 is 7 2 Difference of of the squares of any t...........

Quantitative Aptitude (CDS) Number System
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    Consider the following statements :

    1. Unit digit in 17174 is 7 .

    2. Difference of of the squares of any two odd numbers is always divisible  by 8.

    3. Adding 1 to the product of two numbers makes it a perfect square.

    Which of the above statements are correct?

    1,2 and 3

    Incorrect Answer

    1 and 2 only

    Correct Answer

    2 and 3 only

    Incorrect Answer

    1 and 3 only

    Incorrect Answer
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    Explanation:

    17174=(17172x172 )
    Unit digit of 17172 is 1 and 172 is 9.
    Hence unit digit of  17174 = 9.
    let 3 and 5 be two odd number , the difference of their squares is = 25 -9 = 16 . ( => statement 2 is correct)


     

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