$$1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 = ?$$
$36$
$$3+3+4+5+6+7+8$$
$$6+4+5+6+7+8$$
$$10+5+6+7+8$$
$$15+6+7+8$$
$$21+7+8$$
$$28+8$$
$$36$$
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$2^{2}\times 3^{2}$
