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Mnenie [13.5K]
4 years ago
12

.. List the 15thand 19thtriangular numbers.​

Mathematics
1 answer:
andrezito [222]4 years ago
8 0

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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<em>simplify: </em>

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chole was unboxing some of her old winter clothes. she found four boxes of clothing and inside each box there were two scarves a
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