Question

1- considere as sequências : PA(1,3,X...) e PG ( 5,15,Y,...) determine o valor de x+y
2- calcule o 30° termo da PA (2,6,10,...)

Answer 1

1- P.A:

X =A2+R
X =3+2
X =5

P.G:

Y =A2.R
Y =15.3
Y =45

X+Y=
5+45=
50

2-An=?, A1=2, N=30, R=4

An= A1+ (N-1).R
An= 2+ (30-1).4
An= 2+ 29.4
An= 2+ 116
An= 118