The First Two Terms of the Arithmetic Sequence Are Given $a _ { 1 } = - 1 , a _ { 2 } = 6 , a _ { 11 } =\square$

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Q17: Determine whether the sequence is arithmetic.If so,find

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Q19: Find a formula for a_n?for

Q20: Write the first five terms of the

Q21: The first two terms of the arithmetic