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Deepak Bora
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3, 1, – 1, – 3 give the first term and the common difference.

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The following question is from NCERT Book Ch.-5 Excersice 5.1 Question no. 3(i) Give the 1st term and find the Common difference in the given series. Give the solution of the question.

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  1. Solution:

    3, 1, – 1, – 3 …

    1st term, a = 3

    Common difference (c.d), d = 2nd term – 1st term

    1 – 3 = -2

    d = -2

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