Assertion: triangle's number | /r/HasProperty | t n
Facets:
Source sentences:
text: For every triangular number T n {\displaystyle T_{n}} , imagine a "half-square" arrangement of objects corresponding to the triangular number, as in the figure below.
text: The triangular number T n solves the handshake problem of counting the number of handshakes if each person in a room with n +