Multiple Choice Questions on If 7 times the 7th term of an A P is equal to 11 times its 11th term then the 18th term of the A P i........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

If 7 times the 7th term of an A P is equal to 11 times its 11th term then the 18th term of the A P i...........

Quantitative Aptitude ( CCS) Arithmetic progression
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    If 7 times the 7th term of an A.P. is equal to 11 times its 11th term, then the 18th term of the A.P. is

    1

    Incorrect Answer

    2

    Incorrect Answer

    0

    Correct Answer

    3

    Incorrect Answer
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    Explanation:

    (a7) = 11(a11)
    => 7 (a + 6d) = 11 ( a + 10d)
    => 7a + 42d = 11a +110d
    => -4a = 68d
    => a = -17d
    => -a = 17d -----------(1)
    a18 = a + 17d ( from 1)
    => a18 = a + (-a)
    => a18 = 0

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