3+7+11+.......25terms
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the answer is 675. Hope it helps please mark my answer the brainliest and follow me.
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ans.
given ,
a = 3 , l = 25 , n= 25
Sn =n/2 ( a + l )
= S25 = 25/2 ( 3 + 25)
= S25 = 25/2 × 28
= S25 = 25× 14
S25 = 350. { ans. }
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