1 * 2 + 2 * 3 + 3 * 4 + 4 * 5 + ?
1 * 2 + 2 * 3 + 3 * 4 + 4 * 5 + . + 15 * 16 * = multiplicación urgente.
10Urzua20
1 * 2 + 2 * 3 + 3 * 4 + 4 * 5 + . + 15 * 16 * = multiplicación urgente.
En resumen
1x2 + 2x3 + 3x4 + 4x5 + . + 15x16 1x2 + 2x3 + 3x4 + 4x5 + . + n(n + 1) donde n = 15 <img src="https://tex.z-dn.net/?f=%20%5Cfrac%7Bn%28n%2B1%29%28n%2B2%29%7D%7B3%7D%20" /> <img src="https://tex.z-dn.net/?
1x2 + 2x3 + 3x4 + 4x5 + .
+ 15x16
1x2 + 2x3 + 3x4 + 4x5 + .
+ n(n + 1)
donde n = 15
<img src="https://tex.z-dn.net/?f=%20%5Cfrac%7Bn%28n%2B1%29%28n%2B2%29%7D%7B3%7D%20" />
<img src="https://tex.z-dn.net/?f=%20%5Cfrac%7B15%2815%2B1%29%2815%2B2%29%7D%7B3%7D%20%3D%20%20%5Cfrac%7B15%2816%29%2817%29%7D%7B3%7D%20%3D%20%5Cfrac%7B4080%7D%7B3%7D%20%3D%201360" />
la suma es 1360
axllxa.