Multiple Choice Questions on What is the unit digit of 15 25 35 hellip 205 ........ for SSC CGL Exam Preparation

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Multiple Choice Questions

What is the unit digit of 15 25 35 hellip 205 ........

Quantitative Aptitude (CGL) Arithmetic progression
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    What is the unit digit of 15 + 25 + 35 + … + 205?

    0

    Correct Answer

    5

    Incorrect Answer

    2

    Incorrect Answer

    4

    Incorrect Answer
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    Explanation:

    Let S=15+25+35+……..205. Let 205 is the nth term. So, 205=15+(n-1)10,
    or (n-1)×10=205-15=190
    or,10n-10=190, or 10n=200,or n=20. Now S=20/2(15+205)=10×220=2200. The unit digit is 0

    By: MIRZA SADDAM HUSSAIN
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