Ap is a,a+d.....a+(n-1)d find sn
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sn=(n/2)(a+an)
sn=(n/2)(a+a+(n-1)d)
sn=(n/2)(2a+(n-1)d)
sn=(n/2)(a+a+(n-1)d)
sn=(n/2)(2a+(n-1)d)
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