Multiple Choice Questions on The 7th term of an AP is 39 12 and the 15th term is 103 12 What is the 27th term ........ for Mathematics - All Exams Preparation

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Multiple Choice Questions

The 7th term of an AP is 39 12 and the 15th term is 103 12 What is the 27th term ........

Quantitative Aptitude ( CCS) Arithmetic progression
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    The 7th term of an AP is -39/12 and the 15th term is -103/12. What is the 27th term?

    -187/12

    Incorrect Answer

    -191/12

    Incorrect Answer

    -199/12

    Correct Answer

    -205/12

    Incorrect Answer
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    Explanation:

    The 7th term is a + 6d = -39/12
    The 15th term is a + 14d = -103/12
    Equating these terms with their values and solving as simultaneous equations,
    we get a = 3/4 and d = – 2/3.
    So the 27th term is (a + 26d) = 3/4 + (-52/3) = -199/12.

    By: Amit Kumar
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