The 50th triangle number is 1275.
It could be represented by a triangle with base 50 and height 50, with the horizontal measure increasing by one unit for every unit move in the vertical direction.
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The 50th triangular number is (50)(51)/2=1275
List of triangular numbers 1,3,6,... work out the rest
A number is a single term so there cannot be a 50th term for a number.
100
50th