Maths

please explain this mcq- According to Euclid's division of Lemma, for a and 5 if a=5q+r is unique then r = ...... is not possible.
A. 0
B. 2
C. 4
D. 6

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  1. The Lemma says that for any pair, a,b we can find q,r such that

    a = bq+r

    The above equation is just

    a ≡ r (mod 5)

    There is no unique value of a which will determine r.

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