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Given first term of an ap …

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Given first term of an ap is 10 and the last term is 46 and sum of n terms Is 140 find its common difference

    • Posted by Chirag Khandelwal 6 years, 11 months ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Abhik Kumar 6 years, 11 months ago

    S = n/2(a+l) 140 = n/2(10+46) 140 = n/2(56) 140 = n*28 n = 140/28 = 5 Nth term = a + (n-1)d 46= 10 + (5-1)d 46 = 10 + 4*d 4*d = 46 - 10 = 36 D = 36/4 = 9

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