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    Question

    Sum of first 20 terms of an AP is 610. First term = 12.

    Find approximate common difference.
    A 2 Correct Answer Incorrect Answer
    B 28 Correct Answer Incorrect Answer
    C 19 Correct Answer Incorrect Answer
    D 46 Correct Answer Incorrect Answer

    Solution

    ATQ, тЖТ S = (n/2)[2a + (nтАУ1)d] тЖТ 610 = 10(24 + 19d) тЖТ d = 37/19 тЙИ 1.95 or 2

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