17. Compute d = ged(28, 124). Find integers x, y so that 28x + 124y = d. 18. Find the order of the element 3 in Z15. 19. Find the order of the element o = 0123 in S4. 3210 20. Find the order of the element (2, 3) in the direct product group Z4 × 28. 1 7.

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