merihan merihan

21-05-2020
Mathematics

contestada

.. List the 15th
and 19th
triangular numbers.

Respuesta :

PollyP52 PollyP52

21-05-2020

Answer:

See below in bold.

Step-by-step explanation:

The formula is Tn = n(n + 1) / 2

The first triangular number is 1(1+1) / 2 = 2/2 = 1.

So the 15th = 15(15+1) / 2 = 120.

and the 19th = (19 * 20) / 2 = 190.

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