Find the nth and 20th term of the series 7 + 4 + 1-2-5
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a=7
d=-3
a+(n-1)d=0
7+(n-1)-3=0
-3n+3=-7
n=10/3
7+(20-1)-3 =0
7-57=0
-50=0
the nth term is 10/3
the 20th term is -50
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