0an = a+(n-1)d
Where an=last term
a=first term
d=common difference
n=number of term
Note: last term is denoted by an or l
Sn=n/2[2a+(n-1)d
Sn=sum of all terms
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Where an=last term
a=first term
d=common difference
n=number of term
Note: last term is denoted by an or l
Sn=n/2[2a+(n-1)d
Sn=sum of all terms
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