If=[x(x+1)]/2,for all integers x,andy=,thenis____.

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If=[x(x+1)]/2,for all integers x,andy=,thenis____.

If=[x(x+1)]/2,for all integers x,andy=,thenis____.
If=[x(x+1)]/2,for all integers x,andy=,thenis____.

If=[x(x+1)]/2,for all integers x,andy=,thenis____.
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