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\$\begingroup\$ Since \${1 \over 2} (n+m)(n+m+1)\$ is the sum of the first \$n+m\$ positive integers, +LO+ works as the Cardinal mode. \$\endgroup\$

ovs
– ovs

2020-10-17 11:32:33 +00:00
Commented Oct 17, 2020 at 11:32

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