Multiple choice

What is the LCM of 19 and 21?

  1. 284

  2. 297

  3. 357

  4. 399
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Prime Factors of 19 = 1 x 19 Prime Factors of 21 = 3 x 7 LCM of 19 and 21 = 19 x 3 x 7 = 399

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