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Advent calendar 2018

18 December

All 2018 advent puzzles ~ More information

There are 6 terms in the expansion of \((x+y+z)^2\):

$$(x+y+z)^2=x^2+y^2+z^2+2xy+2yz+2xz$$

Today's number is number of terms in the expansion of \((x+y+z)^{16}\).

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