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25.Find the middle terms of the A.P 7, 13, 19,,241

Answer»

a=7d=6

241=a+(n-1)d241=7+(n-1)6234/6=n-139=n-1n=40

Therefore,last term of the given AP is 40th term

Middle term would be the 20th term

20th term=7+(20-1)6=7+19*6=7+114=121



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