2, 3 and 13
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78
78 = 13 x 3 x 2 Therefore, the greatest prime factor of 78 is 13.
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The prime factorization of 78 is 2x3x13.
A factor tree of 78: 78 6 x 13 (2x3) x 13 Since 2, 3, and 13 are prime numbers, the factor tree is complete.