a=1
d=2
n=75 then find sn in both methods.
method 1 - {sn = 2a (n+ -1) * d}
method 2 - sn = n/2 {t1 + tn}
d=2
n=75 then find sn in both methods.
method 1 - {sn = 2a (n+ -1) * d}
method 2 - sn = n/2 {t1 + tn}
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