Discrepancy Between 1 Chron. 21:6 and 1 Chron. 27:24?

Question: 1 Chron. 21:6. What explains the apparent discrepancy between this and chap. 27:24?
Answer: There is no discrepancy. One text says, that Joab did not count among those that were counted Levi and Benjamin; the other adds the particular, that though he began to number, he finished not, and divine displeasure fell for it upon Israel; and the number was not put in the account of the chronicles of King David. All is harmonious; but the second is a fuller explanation.