Which expression calculates the nnn-th term if you know the (n−1)(n-1)(n−1)-th term?
an=an−1+da_n = a_{n-1} + dan=an−1+d
an=an−1×da_n = a_{n-1} \times dan=an−1×d
an=an−1−da_n = a_{n-1} - dan=an−1−d
an=an−1da_n = \frac{a_{n-1}}{d}an=dan−1