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The difference between successive terms is constant in an arithmetic sequence, while the ratio between successive terms is constant in a geometric sequence.

Both arithmetic and geometric sequences have a constant difference between successive terms.

The difference between successive terms is constant in a geometric sequence, while the ratio between successive terms is constant in an arithmetic sequence. (correct)

Both arithmetic and geometric sequences have a constant ratio between successive terms.

a_n = a_{n-1} - r; a_0 = a

a_n = a_{n-1} + r; a_0 = a

a_n = a_{n-1} / r; a_0 = a

a_n = a_{n-1} * r; a_0 = a (correct)

Add the common ratio to a_1.

Subtract the common difference from a_1.

Divide a_1 by the common difference.

Subtract the first term from a_1 and divide the result by the common difference. (correct)