if the nth term of an AP is tn =3n-2, what is the common difference
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sub n=1 s1=3(1)-2=1
sub n=2 s2=3(2)-1=5
s1=a1 ,s2=a+d
5=1+d
d=5-1=4
sub n=2 s2=3(2)-1=5
s1=a1 ,s2=a+d
5=1+d
d=5-1=4
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