Multiple Choice Questions on Find the first term of AP whose 8th and 11th term are 39 and 60 respectively ........ for CDS Exam Preparation

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Multiple Choice Questions

Find the first term of AP whose 8th and 11th term are 39 and 60 respectively ........

Quantitative Aptitude (CDS) Arithmetic progression
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    Find the first term of AP whose 8th and 11th term are 39 and 60 respectively?

    -10
     

    Correct Answer

    4
     

    Incorrect Answer

    6
     

    Incorrect Answer

    none of these
     

    Incorrect Answer
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    Explanation:


     nth term of AP is =a+d(n-1)
     39=a+d(8-1) .... equation1
     60=a+d(11-1) ..... equation2
     solving 1 and 2
     d=7
     putting value of d=7 in equation1
     a=-10

    By: bhavesh kumar singh
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