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For the following arithmetic sequence, if a_1=21 and d= -3 what is a_1000 ?

For the following arithmetic sequence, if a_1=21 and d= -3 what is a_1000 ?
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For the following arithmetic sequence, if a_1=21 and d= -3 what is a_1000 ?

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User Asikorski
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-2976  use formula a_1 + (n-1)d   n = term number ( in this case 1000)
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User Tapas Talukder
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