Question

Quantos termos tem a PA (-2,0,2,...110)​

Answer 1

resolução!

r = a2 - a1

r = 0 - (-2)

r = 2

an = a1 + ( n - 1 ) r

110 = - 2 + ( n - 1 ) 2

110 = - 2 + 2n - 2

110 = - 4 + 2n

110 + 4 = 2n

114 = 2n

n = 114/2

n = 57

Answer 2

an = a1+(n—1).r

r =0 —(—2)=2

110 = —2+(n—1).2

110 = —2 +2n—2

110 +2+2 = 2n

114 = 2n

n = 114/2

n = 57