meer282 meer282
  • 24-02-2019
  • Mathematics
contestada

how do i solve this please help​

how do i solve this please help class=

Respuesta :

jimrgrant1 jimrgrant1
  • 24-02-2019

Answer:

see explanation

Step-by-step explanation:

(a)

[tex]S_{n}[/tex] = 1 + 2 + 3 + 4 + 5 + ..... ( to n terms ), that is

∑ n ( for r = 1 to n )

∑ n = [tex]\frac{1}{2}[/tex] n(n + 1) = [tex]S_{n}[/tex]

(b)

[tex]S_{30}[/tex] = [tex]\frac{1}{2}[/tex] × 30 × 31 = 465

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