Are the following statements correct or incorrect?
If 1, 4, 7 are the first three terms of the arithmetic sequence, then the fifth is term 13.
The common difference of the arithmetic sequence 2, 0, -2, -4, ... is equal to 2.
The first term of the geometric sequence is 4 and the second term is 2. The fourth term of this sequence is 16.
The coefficient of the geometric sequence with the first three terms 2, 4, 8 is equal to 2.
