Answer
$50,30,10,-10,-30,-50$
Work Step by Step
Formula to calculate the nth term of an arithmetic sequence is: $a_n=a_1+d(n-1)$
Here, $a_1: $ First term and $d=$ common difference
Since, we have $a_1=50$
Use a recursion formula to find the remaining five terms.
Then $a_2=a_1-20=50-20=30;\\a_3=a_2-20=30-20=10;\\a_4=a_3-20=10-20=-10;\\a_5=a_4-20=-10-20=-30;\\a_6=a_5-20=-30-20=-50$
Hence, the first six terms are: $50,30,10,-10,-30,-50$
