Corect: a 1 + (n-1)•r, a n-1 + r, a 1 + r• (n-1), r + a n-1, (a n-1 + a n+1 )/2, Incorect: a 1 + a n, a 1 + ( n+1 ) • r, a 1 + n•r, a n-1 + a n+1, a n + (n-1)• r,

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