Find an Explicit Rule for the Nth Term of the Arithmetic

Multiple Choice

Find an explicit rule for the nth term of the arithmetic sequence.
- $$\mathrm { a } _ { 17 } = - 46 , \mathrm { a } _ { 19 } = - 144$$

A) $a _ { n } = 738 - 49 ( n + 1 )$
B) $a _ { n } = 738 - 49 ( n - 1 )$
C) $a _ { n } = 738 + 49 ( n + 1 )$
D) $a _ { n } = 738 - 49 ( n - 2 )$