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You are watching: What is the lcm of 3 and 21
We think you wrote:
lcm(3,15,21)
This encounters the least typical multiple (LCM) by prime factorization.
1. discover the prime factors of 3
2. uncover the prime components of 15
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The prime components of 15 space 3 and 5.
Determine the maximum variety of times each prime aspect (3, 5, 7) wake up in the administer of the given numbers: