# If the 7th term of a sequence is 33 and the 10th term is 21, find the common difference d

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If the 7th term of a sequence is 33 and the 10th term is 21, find the common difference d.

[latex]a_{10}=a_9+d=a_8+2d=a_7+3d[/latex] So, you have [latex]21=33+3d\implies d=-4[/latex]

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