Sigma notation
1+2+3+4+5 in sigma notation, we notice that the general term is just k and that there are 5 terms, so we would write 1+2+3+4+5 = X5 k=1 k. To write the second sum 1+4+9+16+25+36 in sigma notation, we notice that the general term is k2 and that there are 6 terms, so we would write
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