find the arithmetic mean of nth term of a.p
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N/2{2a+{n-1}d} this is the formula for am of nth term of an AP
rohit309:
Thank u
N/2[2a+(n-1)d]
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Sn = N/2 (2A+[N-1]D)
Sn = N/2[A+L]
Sn = N/2[A+L]
Sn=[sum of middle terms of progression]×(n/2)
if there is only one middle term then you can keep that only
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