1.

Determine the set of all integers a such that a ≡ 3 (mod 7) such that −21 ≤ x ≤ 21.

A. {−21, −18, −11, −4, 3, 10, 16}
B. {−21, −18, −11, −4, 3, 10, 17, 24}
C. {−24, -19, -15, 5, 0, 6, 10}
D. {−23, −17, −11, 0, 2, 8, 16}
Answer» C. {−24, -19, -15, 5, 0, 6, 10}


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