nikhilpun36 nikhilpun36

02-06-2021
Business

contestada

the sum of a and 3a is

Respuesta :

mahraalirashid mahraalirashid

02-06-2021

Answer:

Given,

3a,a,_a.......a terms

Sn=n/2[2(a)+(n-1)d]

Sa=a/2(6a-2a+1)

Sa=a/2(2(2a+1)

Sa=a(2a+1)

Sa=2a^2+a

Explanation:

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