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

    Question

    What is the unit digit of 49 15?

    A 9 Correct Answer Incorrect Answer
    B 4 Correct Answer Incorrect Answer
    C 7 Correct Answer Incorrect Answer
    D 1 Correct Answer Incorrect Answer

    Solution

    Cyclicity of 9 is 2 (i,e. 9 & 1).So to find last digit we will check if power is odd then 9 will come in the unit place and if power is even 1 will come in the unit place.In 49 15 power is odd so 9 will come in the unit place.

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