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\left. \begin array l \text 78 a = 1 , d = \square , t _ n = 149 \\ t _ n = a %2B ( n - 1 ) d \\ 149 = \square \\ 149 = 2 n - \square \\ n = \square \end array \right. |
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Answer» d=3-1=2149=1+(n-1)2149=1+2n-2149=2n-1150=2nn=75 |
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