aguzman aguzman

03-07-2015
Mathematics

contestada

the sum of the first 30 terms of the sequence an=6n+5 is

Respuesta :

kimeto3 kimeto3

03-07-2015

Sum= n(a₁+an)/2 where a₁ is the first term, and an is the nth term(30th for this)
an= 6n+5
a₁=6(1)+5
=11
a₃₀=6(30)+5
=185
Sum= 30(11+185)/2
=15(196)
=2940

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