if a=d then find Sn:tn
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Step-by-step explanation:
Tn = a + (n-1)d
= a + an -a......... (a = d)
= an
Sn = n/2 [2a +(n-1)d]
= n/2 [2a + an -a].......... (a = d)
= n/2 [ a +an]
Sn : Tn
n/2 [ a + an]: an
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