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    A number when divided by 7 leaves a remainder 4. What will be the remainder when the square of the same number is divided by 7?
    Question

    A number when divided by 7 leaves a remainder 4. What will be the remainder when the square of the same number is divided by 7?

    A.

    3

    B.

    1

    C.

    4

    D.

    2

    Correct option is D

    Given:

    A number leaves a remainder 4 when divided by 7,

    Concept Used:
    Dividend = Divisor × quotient + remainder

    Solution:

    Let the number be x

    So,

    x =7k + 4 for some integer k

    minimum possible value of k = 1

    x = 7(1) + 4 = 11

    Now, dividing (11)2 by 7

    121 ÷ 7 gives 2 as a remainder

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