New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    Find the unit digit of (62375 -

    7).
    A 8 Correct Answer Incorrect Answer
    B 9 Correct Answer Incorrect Answer
    C 2 Correct Answer Incorrect Answer
    D 1 Correct Answer Incorrect Answer

    Solution

    Cyclicity of 2 = 2, 4, 6, 8, 2 Hence, we can see the unit digit repeat themselves after every power of 4 So, unit digit of (62375 - 7) = unit digit of (24 X 93 + 3 - 7) = unit digit of (23 - 7) = unit digit of (8 - 7) = 1

    Practice Next