New Enroll here to Join NaBFID Analyst Into Class on May 6

    Question

    If x = 19, then the value of x5 -

    20x4 + 20x3 - 20x2 + 20x - 1 is
    A 18 Correct Answer Incorrect Answer
    B 20 Correct Answer Incorrect Answer
    C 11 Correct Answer Incorrect Answer
    D 14 Correct Answer Incorrect Answer

    Solution

    Given expression :  x 5 - 20x 4 + 20x 3 - 20x 2 + 20x - 1 = x5 - 19x 4 - x4 + 19 x 3 + x3 - 19 x2 - x2 + 19 x + x - 1 = x5 -x5 -x4 + x4 +x3-x3-x2+x2+21 -1 [given that x = 19] = 19-1 = 18

    Practice Next

    Relevant for Exams: