How do i solve this please help

asked Sep 21, 2020 210k views

4 votes

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1 vote

Answer:

see explanation

Explanation:

(a)

S_(n) = 1 + 2 + 3 + 4 + 5 + ..... ( to n terms ), that is

∑ n ( for r = 1 to n )

∑ n =
(1)/(2) n(n + 1) =
S_(n)

(b)

S_(30) =
(1)/(2) × 30 × 31 = 465

Tod Birdsall answered Sep 27, 2020

6.1k points

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