Determine the Value of Integer k

Medium Data Sufficiency Determining Sufficiency

What is the value of the integer $k$?

Statement (1): The product of $k$ and 3 is equal to 21.

Statement (2): The sum of $k$ and 5 is less than 15.

Statement (1) alone is sufficient, but statement (2) alone is not sufficient.

Statement (2) alone is sufficient, but statement (1) alone is not sufficient.

Both statements (1) and (2) together are sufficient, but neither statement alone is sufficient.

Each statement alone is sufficient.

Statements (1) and (2) together are not sufficient.

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