3 x 3 = 9
3 x 7 = 21
3 x 3 x 7 = 63, the LCM
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2 x 7 = 14 3 x 7 = 21 2 x 3 x 7 = 42, the LCM
3 x 5 = 15 3 x 7 = 21 Combine the factors, eliminating duplicates. 3 x 5 x 7 = 105, the LCM
The prime factorization of 399 is 3 x 7 x 19. 21 wouldn't be included since it isn't a prime number.
The prime factorization of 50 using exponents is 21 x 52
3 x 7 = 21 No exponents necessary.