the sum of the 1st and 21st terms of an arithmetic sequence is 70. the sum of it's 1st and 22nd term is 74 . find the common difference, find the sum of it's 8th and 14th term and find it's 11th term
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make two eq with the formula of sum -n/2(a+n-1)d and u will value of ine then make the third eq
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