The fifth triangle number, known as T5 is 15.
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The Fifth row of Pascal's triangle has 1,4,6,4,1. The sum is 16.
fifth is an ordinal number!!!!
'Fifth' is the ordinal number of the cardinal number 5.
The Fifth row of Pascal's triangle has 1,4,6,4,1. The sum is 16. Formula 2n-1 where n=5 Therefore 2n-1=25-1= 24 = 16.
28 is a triangle number. The 28th triangle number is 406.