A number is a single term so there cannot be a 50th term for a number.
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50th term means n = 50 So the term is 100-50 = 50
List of triangular numbers 1,3,6,... work out the rest
Nth term With the nth term you substitute the n for the term number (e.g. 50) so the 50th term in 2n+3 would be 2x50+3=103
50th
100