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. Find the missing variable from a, d, n and an, where a is the first term, d is the (2) common difference and an is the nth term of AP. d = –3, n = 18, an = - 5

    • Posted by Ak18 Ak18 5 years, 5 months ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Yogita Ingle 5 years, 5 months ago

    d = –3, n = 18, an=-5

    We need to find a here.

    Using formula an= a+(n-1)d 

    Putting values of d,an and n, we get ,

    –5 = a + (18 – 1) (–3)

    ⇒ −5 = a + (17) (−3)

    ⇒ −5 = a – 51
    ⇒ a = 46

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