Question

ache a soma dos sessenta primeiros termos da PA (2, 5 , 8, ...)

Answer 1

S60 =[ ( a1 + an )× N]/2


an = ??


an = a1 + 59× r.

an = 2 + 59 × 3

an = 179


S60 = [( 2 + 179 ) 60] /2

S60 = 5430

Abc e bons estudos!!