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Mathematics 20 Online
OpenStudy (anonymous):

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ganeshie8 (ganeshie8):

you want to add the terms from 4 to 15

ganeshie8 (ganeshie8):

having that knowledge, which two options you can eliminate ?

ganeshie8 (ganeshie8):

yes !

ganeshie8 (ganeshie8):

when n = 1, since the third option gives u 4 correctly, the correct representation is third option

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