What is the probability of getting a 3-of-a-kind in a 7 card poker hand?

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Obviously, the denominator in the probability formula is $\binom{52}{7}$. For the numerator I was thinking it would be $\binom{13}{1}\binom{4}{3}\binom{48}{4}$, but this gives a probability of about 7.56%, whether wiki says it should be around 4.83%. What's the correct approach?