raylevertte raylevertte

13-04-2018
Mathematics

contestada

Help please what is the sum of the series ?

Help please what is the sum of the series class=

Respuesta :

mkryukova19 mkryukova19

13-04-2018

for this example you can simply substitute i with numbers 1,2,3,4,5, and add terms
4*1+4*2+4*3+4*4+4*5 =60

for more difficult cases you can use formula
(a1+an)n/2

a1=4, a5=20, n=5
(4+20)*5/2=24*5/2=12*5=60

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