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Cosets and Lagrange's Theorem · Easy problem

In Z24\mathbb Z_{24}, let H=⟨8⟩={0,8,16}H = \langle 8\rangle = \{0,8,16\}. Which of the numbers 0,8,16,210, 8, 16, 21 lies in the same left coset of HH as 1313?