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If the sum of the first n terms of the series 4+7+10+... Is 209 ,find n

User Mrpotocnik
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if your question is 4+7+10+n=209 it’s
188
your going to combine the numbers 4+7+10 and get 21
you are now left with 21 and n
21+n=209 you will subtract 21 from 209 to get your missing value 188
User Sivanesh S
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