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How do you compute the greatest common divisor of 1785 and 546 step by step?

To compute the greatest common divisor of 1785 and 546, apply the Euclidean algorithm by repeatedly dividing the previous divisor by the previous remainder. Start with 1785 divided by 546. Continue this process until the remainder is zero. The last non-zero remainder is the greatest common divisor.

Conditions

  • The inputs are 1785 and 546.
  • The Euclidean algorithm is used.
  • The division algorithm is applied at each step.

Reasoning, step by step

  1. 1785=546∗3+1471785 = 546 * 3 + 147
  2. 546=147∗3+105546 = 147 * 3 + 105
  3. 147=105∗1+42147 = 105 * 1 + 42
  4. 105=42∗2+21105 = 42 * 2 + 21
  5. 42=21∗2+042 = 21 * 2 + 0
  6. Identify the last nonzero remainder: 21.
  7. Conclude gcd(1785, 546) = 21.

Example

The screen sequentially displays the long division steps: 1785 by 546, 546 by 147, 147 by 105, 105 by 42, and 42 by 21. The final conclusion '∴\therefore gcd(1785, 546) = 21' is written at 01:54.

Common misconceptions

  • Making arithmetic errors in the long division steps.
  • Stopping before the remainder is 0.
  • Confusing the order of dividend and divisor in each step.

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