Question

3,1,-1,-3..... arthemetic progression
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Answer 1

Answer:

3,1,-1,-3,...

a1=3

a2=1

a3=-1

a4=-3

d1=a2-a1=1-3

d1=-2

d2=a3-a2=-1-1

d2=-2

d3=a4-a3=-3-(-1)=-3+1

d3=-2

since, d1=d2=d3

therefore, 3,1,-1,-3,... is an arthemetic progression