Question

dada a PA (2,5,8,...) a soma dos 14 primeiros termos dessa PA e?

Answer 1

2,5,8,11,14,17,20,23,26,29,32,35,38,41


SN=> (2+41)14/2

43.7=> 301


RESPOSTA=> {soma :.301}

////. /////. ////////. //////. //////. ///////

bom dia!!

Answer 2

an = a1 + (n-1)r
a1 = 2
n = 14 
r = 5-2
r = 3
a14 = 2 + (14-1)3
a14 = 2 + 13.3
a14 = 41

Sn = a1 + an).n/2

S14 = (a1 + a14).14/2

S14 = (2 + 42).7

S14 = 43.7

S14 = 301