state the common difference d for give A.p 3/2,1/2-1/2-3/2
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d=a2-a1
so,
d=1/2-3/2
=-2/2
=-1
d=a3-a2
=-1/2-1/2
=-2/2
=-1
d=a4-a3
=-3/2+1/2
=-2/2
=-1
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