[填空题]
The table shows the first four terc):,gmbrwgu (9oyw*q ms of three seq1 gxk1pp.fo,i,i. p d8tpuu+juences: $u_n$ , $v_n$ , and $w_n$.
1.State which sequence is
1.1.arithmetic is ;
1.2.geometric is .
2.Find the sum of the first 50 terms of the arithmetic sequence.
$S_{50}$= .
3.Find the exact value of the 13th term of the geometric sequence