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damaskus [11]
3 years ago
7

Please help me please!! −

Mathematics
1 answer:
jek_recluse [69]3 years ago
6 0

Answer:

Step-by-step explanation:

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Calcular cuántos números impares hay entre 20 y 50 y calcular su suma​
const2013 [10]

Answer:

<em>La suma de los impares entre 20 y 50 da 875</em>

Step-by-step explanation:

<u>Suma de Progresiones Artiméticas </u>

Una progresión aritmética es aquella en la cual, cada término se obtiene como el anterior mas una cantidad fija llamada diferencia común. El término general de una progresión aritmética es

a_n=a_1+(n-1)r

Donde a_1 es el primer término, n el número de términos y r la diferencia común o radio. La suma de los primeros n términos se calcula como:

\displaystyle S_n=n\frac{a_1+a_n}{2}

En nuestro ejercicio, se deben sumar los números impares entre 20 y 50, se forma la progresión

21, 23, 25, 27, ....49

Sabemos que a_1=21,\ a_n=49,\ r=2

Primero averiguamos cuántos términos son, despejando n del término general

\displaystyle n=\frac{a_n-a_1}{r}+1

\displaystyle n=\frac{49-21}{2}+1

\displaystyle n=25

La progresión tiene 25 términos

Ahora la suma es

\displaystyle S_{25}=25\frac{21+49}{2}

\displaystyle S_{25}=25\frac{70}{2}

S_{25}=875

La suma de los impares entre 20 y 50 da 875

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A flying squirrel's nest is 56 feet high in a tree. From its nest, the flying squirrel glides 70 feet to reach an acorn that is
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Answer:

Step-by-step explanation:

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