n(n+1)/2, for all integers from 1 to n Crossword Clue
3 letters · New York Times · Tuesday, December 22, 2015 · 49-Down
Appeared in 1 New York Times Crossword: Tuesday, December 22, 2015.
Exact puzzle match · New York Times · December 22, 2015 · 49-Down · 3 letters
SUM0 of 3 letters revealed
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What does this clue mean?
a set containing all and only the members of two or more given sets; "let C be the union of the sets A and B"
noun
WordNet® (Princeton University)
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