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Oloshi
Answers (1)
= initial term of A.P. d = common difference an = a1 + ( n - 1 ) d = nth term of the sequence a8 = a1 + ( 8 - 1 ) d a8 = a1 + 7 d Sum of the n members in A.P: Sn = n ( a1 + an ) / 2 S8 = 8 ( a1 + a8 ) / 2 = 80 ( 8 / 2 ) ( a1 + a1 + 7 d ) = 80 4 ( 2 a1 + 7
