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The 7th and 3rd term is …

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The 7th and 3rd term is an ap is 12 and 5 find the 13th term

    • Posted by Arun Kumar Arun Kumar 7 years, 8 months ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Priyanshi Narang 7 years, 8 months ago

    7th term of ap = a+6d .. (1), 3rd term of ap=a+2d .. (2), Subtracting (2) from (1), a + 6d =12 -a - 2d = -5 -------------------- 4d =7 d=7÷4, a=12-6d, 12-6×7÷4, a=3÷2 Now, 13th term of ap=45÷2

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