If sum of n terms of an A.P is 4n^2+7n find the 15th term
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Tn=Sn---S_n-1=
T15=4×15²+7×15-(4×14²+7×14)
T15=15×67-14×63=1005-882=123
T15=4×15²+7×15-(4×14²+7×14)
T15=15×67-14×63=1005-882=123
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